(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.adapter = f()}})(function(){var define,module,exports;return (function(){function r(e,n,t){function o(i,f){if(!n[i]){if(!e[i]){var c="function"==typeof require&&require;if(!f&&c)return c(i,!0);if(u)return u(i,!0);var a=new Error("Cannot find module '"+i+"'");throw a.code="MODULE_NOT_FOUND",a}var p=n[i]={exports:{}};e[i][0].call(p.exports,function(r){var n=e[i][1][r];return o(n||r)},p,p.exports,r,e,n,t)}return n[i].exports}for(var u="function"==typeof require&&require,i=0;i<t.length;i++)o(t[i]);return o}return r})()({1:[function(require,module,exports){
	/*
	 *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
	 *
	 *  Use of this source code is governed by a BSD-style license
	 *  that can be found in the LICENSE file in the root of the source
	 *  tree.
	 */
	/* eslint-env node */
	
	'use strict';
	
	var _adapter_factory = require('./adapter_factory.js');
	
	var adapter = (0, _adapter_factory.adapterFactory)({ window: typeof window === 'undefined' ? undefined : window });
	module.exports = adapter; // this is the difference from adapter_core.
	
	},{"./adapter_factory.js":2}],2:[function(require,module,exports){
	'use strict';
	
	Object.defineProperty(exports, "__esModule", {
	  value: true
	});
	exports.adapterFactory = adapterFactory;
	
	var _utils = require('./utils');
	
	var utils = _interopRequireWildcard(_utils);
	
	var _chrome_shim = require('./chrome/chrome_shim');
	
	var chromeShim = _interopRequireWildcard(_chrome_shim);
	
	var _firefox_shim = require('./firefox/firefox_shim');
	
	var firefoxShim = _interopRequireWildcard(_firefox_shim);
	
	var _safari_shim = require('./safari/safari_shim');
	
	var safariShim = _interopRequireWildcard(_safari_shim);
	
	var _common_shim = require('./common_shim');
	
	var commonShim = _interopRequireWildcard(_common_shim);
	
	var _sdp = require('sdp');
	
	var sdp = _interopRequireWildcard(_sdp);
	
	function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) newObj[key] = obj[key]; } } newObj.default = obj; return newObj; } }
	
	// Shimming starts here.
	/*
	 *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
	 *
	 *  Use of this source code is governed by a BSD-style license
	 *  that can be found in the LICENSE file in the root of the source
	 *  tree.
	 */
	function adapterFactory() {
	  var _ref = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {},
		  window = _ref.window;
	
	  var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {
		shimChrome: true,
		shimFirefox: true,
		shimSafari: true
	  };
	
	  // Utils.
	  var logging = utils.log;
	  var browserDetails = utils.detectBrowser(window);
	
	  var adapter = {
		browserDetails: browserDetails,
		commonShim: commonShim,
		extractVersion: utils.extractVersion,
		disableLog: utils.disableLog,
		disableWarnings: utils.disableWarnings,
		// Expose sdp as a convenience. For production apps include directly.
		sdp: sdp
	  };
	
	  // Shim browser if found.
	  switch (browserDetails.browser) {
		case 'chrome':
		  if (!chromeShim || !chromeShim.shimPeerConnection || !options.shimChrome) {
			logging('Chrome shim is not included in this adapter release.');
			return adapter;
		  }
		  if (browserDetails.version === null) {
			logging('Chrome shim can not determine version, not shimming.');
			return adapter;
		  }
		  logging('adapter.js shimming chrome.');
		  // Export to the adapter global object visible in the browser.
		  adapter.browserShim = chromeShim;
	
		  // Must be called before shimPeerConnection.
		  commonShim.shimAddIceCandidateNullOrEmpty(window, browserDetails);
	
		  chromeShim.shimGetUserMedia(window, browserDetails);
		  chromeShim.shimMediaStream(window, browserDetails);
		  chromeShim.shimPeerConnection(window, browserDetails);
		  chromeShim.shimOnTrack(window, browserDetails);
		  chromeShim.shimAddTrackRemoveTrack(window, browserDetails);
		  chromeShim.shimGetSendersWithDtmf(window, browserDetails);
		  chromeShim.shimGetStats(window, browserDetails);
		  chromeShim.shimSenderReceiverGetStats(window, browserDetails);
		  chromeShim.fixNegotiationNeeded(window, browserDetails);
	
		  commonShim.shimRTCIceCandidate(window, browserDetails);
		  commonShim.shimConnectionState(window, browserDetails);
		  commonShim.shimMaxMessageSize(window, browserDetails);
		  commonShim.shimSendThrowTypeError(window, browserDetails);
		  commonShim.removeExtmapAllowMixed(window, browserDetails);
		  break;
		case 'firefox':
		  if (!firefoxShim || !firefoxShim.shimPeerConnection || !options.shimFirefox) {
			logging('Firefox shim is not included in this adapter release.');
			return adapter;
		  }
		  logging('adapter.js shimming firefox.');
		  // Export to the adapter global object visible in the browser.
		  adapter.browserShim = firefoxShim;
	
		  // Must be called before shimPeerConnection.
		  commonShim.shimAddIceCandidateNullOrEmpty(window, browserDetails);
	
		  firefoxShim.shimGetUserMedia(window, browserDetails);
		  firefoxShim.shimPeerConnection(window, browserDetails);
		  firefoxShim.shimOnTrack(window, browserDetails);
		  firefoxShim.shimRemoveStream(window, browserDetails);
		  firefoxShim.shimSenderGetStats(window, browserDetails);
		  firefoxShim.shimReceiverGetStats(window, browserDetails);
		  firefoxShim.shimRTCDataChannel(window, browserDetails);
		  firefoxShim.shimAddTransceiver(window, browserDetails);
		  firefoxShim.shimGetParameters(window, browserDetails);
		  firefoxShim.shimCreateOffer(window, browserDetails);
		  firefoxShim.shimCreateAnswer(window, browserDetails);
	
		  commonShim.shimRTCIceCandidate(window, browserDetails);
		  commonShim.shimConnectionState(window, browserDetails);
		  commonShim.shimMaxMessageSize(window, browserDetails);
		  commonShim.shimSendThrowTypeError(window, browserDetails);
		  break;
		case 'safari':
		  if (!safariShim || !options.shimSafari) {
			logging('Safari shim is not included in this adapter release.');
			return adapter;
		  }
		  logging('adapter.js shimming safari.');
		  // Export to the adapter global object visible in the browser.
		  adapter.browserShim = safariShim;
	
		  // Must be called before shimCallbackAPI.
		  commonShim.shimAddIceCandidateNullOrEmpty(window, browserDetails);
	
		  safariShim.shimRTCIceServerUrls(window, browserDetails);
		  safariShim.shimCreateOfferLegacy(window, browserDetails);
		  safariShim.shimCallbacksAPI(window, browserDetails);
		  safariShim.shimLocalStreamsAPI(window, browserDetails);
		  safariShim.shimRemoteStreamsAPI(window, browserDetails);
		  safariShim.shimTrackEventTransceiver(window, browserDetails);
		  safariShim.shimGetUserMedia(window, browserDetails);
		  safariShim.shimAudioContext(window, browserDetails);
	
		  commonShim.shimRTCIceCandidate(window, browserDetails);
		  commonShim.shimMaxMessageSize(window, browserDetails);
		  commonShim.shimSendThrowTypeError(window, browserDetails);
		  commonShim.removeExtmapAllowMixed(window, browserDetails);
		  break;
		default:
		  logging('Unsupported browser!');
		  break;
	  }
	
	  return adapter;
	}
	
	// Browser shims.
	
	},{"./chrome/chrome_shim":3,"./common_shim":6,"./firefox/firefox_shim":7,"./safari/safari_shim":10,"./utils":11,"sdp":12}],3:[function(require,module,exports){
	/*
	 *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
	 *
	 *  Use of this source code is governed by a BSD-style license
	 *  that can be found in the LICENSE file in the root of the source
	 *  tree.
	 */
	/* eslint-env node */
	'use strict';
	
	Object.defineProperty(exports, "__esModule", {
	  value: true
	});
	exports.shimGetDisplayMedia = exports.shimGetUserMedia = undefined;
	
	var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; };
	
	var _getusermedia = require('./getusermedia');
	
	Object.defineProperty(exports, 'shimGetUserMedia', {
	  enumerable: true,
	  get: function get() {
		return _getusermedia.shimGetUserMedia;
	  }
	});
	
	var _getdisplaymedia = require('./getdisplaymedia');
	
	Object.defineProperty(exports, 'shimGetDisplayMedia', {
	  enumerable: true,
	  get: function get() {
		return _getdisplaymedia.shimGetDisplayMedia;
	  }
	});
	exports.shimMediaStream = shimMediaStream;
	exports.shimOnTrack = shimOnTrack;
	exports.shimGetSendersWithDtmf = shimGetSendersWithDtmf;
	exports.shimGetStats = shimGetStats;
	exports.shimSenderReceiverGetStats = shimSenderReceiverGetStats;
	exports.shimAddTrackRemoveTrackWithNative = shimAddTrackRemoveTrackWithNative;
	exports.shimAddTrackRemoveTrack = shimAddTrackRemoveTrack;
	exports.shimPeerConnection = shimPeerConnection;
	exports.fixNegotiationNeeded = fixNegotiationNeeded;
	
	var _utils = require('../utils.js');
	
	var utils = _interopRequireWildcard(_utils);
	
	function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) newObj[key] = obj[key]; } } newObj.default = obj; return newObj; } }
	
	function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
	
	function shimMediaStream(window) {
	  window.MediaStream = window.MediaStream || window.webkitMediaStream;
	}
	
	function shimOnTrack(window) {
	  if ((typeof window === 'undefined' ? 'undefined' : _typeof(window)) === 'object' && window.RTCPeerConnection && !('ontrack' in window.RTCPeerConnection.prototype)) {
		Object.defineProperty(window.RTCPeerConnection.prototype, 'ontrack', {
		  get: function get() {
			return this._ontrack;
		  },
		  set: function set(f) {
			if (this._ontrack) {
			  this.removeEventListener('track', this._ontrack);
			}
			this.addEventListener('track', this._ontrack = f);
		  },
	
		  enumerable: true,
		  configurable: true
		});
		var origSetRemoteDescription = window.RTCPeerConnection.prototype.setRemoteDescription;
		window.RTCPeerConnection.prototype.setRemoteDescription = function setRemoteDescription() {
		  var _this = this;
	
		  if (!this._ontrackpoly) {
			this._ontrackpoly = function (e) {
			  // onaddstream does not fire when a track is added to an existing
			  // stream. But stream.onaddtrack is implemented so we use that.
			  e.stream.addEventListener('addtrack', function (te) {
				var receiver = void 0;
				if (window.RTCPeerConnection.prototype.getReceivers) {
				  receiver = _this.getReceivers().find(function (r) {
					return r.track && r.track.id === te.track.id;
				  });
				} else {
				  receiver = { track: te.track };
				}
	
				var event = new Event('track');
				event.track = te.track;
				event.receiver = receiver;
				event.transceiver = { receiver: receiver };
				event.streams = [e.stream];
				_this.dispatchEvent(event);
			  });
			  e.stream.getTracks().forEach(function (track) {
				var receiver = void 0;
				if (window.RTCPeerConnection.prototype.getReceivers) {
				  receiver = _this.getReceivers().find(function (r) {
					return r.track && r.track.id === track.id;
				  });
				} else {
				  receiver = { track: track };
				}
				var event = new Event('track');
				event.track = track;
				event.receiver = receiver;
				event.transceiver = { receiver: receiver };
				event.streams = [e.stream];
				_this.dispatchEvent(event);
			  });
			};
			this.addEventListener('addstream', this._ontrackpoly);
		  }
		  return origSetRemoteDescription.apply(this, arguments);
		};
	  } else {
		// even if RTCRtpTransceiver is in window, it is only used and
		// emitted in unified-plan. Unfortunately this means we need
		// to unconditionally wrap the event.
		utils.wrapPeerConnectionEvent(window, 'track', function (e) {
		  if (!e.transceiver) {
			Object.defineProperty(e, 'transceiver', { value: { receiver: e.receiver } });
		  }
		  return e;
		});
	  }
	}
	
	function shimGetSendersWithDtmf(window) {
	  // Overrides addTrack/removeTrack, depends on shimAddTrackRemoveTrack.
	  if ((typeof window === 'undefined' ? 'undefined' : _typeof(window)) === 'object' && window.RTCPeerConnection && !('getSenders' in window.RTCPeerConnection.prototype) && 'createDTMFSender' in window.RTCPeerConnection.prototype) {
		var shimSenderWithDtmf = function shimSenderWithDtmf(pc, track) {
		  return {
			track: track,
			get dtmf() {
			  if (this._dtmf === undefined) {
				if (track.kind === 'audio') {
				  this._dtmf = pc.createDTMFSender(track);
				} else {
				  this._dtmf = null;
				}
			  }
			  return this._dtmf;
			},
			_pc: pc
		  };
		};
	
		// augment addTrack when getSenders is not available.
		if (!window.RTCPeerConnection.prototype.getSenders) {
		  window.RTCPeerConnection.prototype.getSenders = function getSenders() {
			this._senders = this._senders || [];
			return this._senders.slice(); // return a copy of the internal state.
		  };
		  var origAddTrack = window.RTCPeerConnection.prototype.addTrack;
		  window.RTCPeerConnection.prototype.addTrack = function addTrack(track, stream) {
			var sender = origAddTrack.apply(this, arguments);
			if (!sender) {
			  sender = shimSenderWithDtmf(this, track);
			  this._senders.push(sender);
			}
			return sender;
		  };
	
		  var origRemoveTrack = window.RTCPeerConnection.prototype.removeTrack;
		  window.RTCPeerConnection.prototype.removeTrack = function removeTrack(sender) {
			origRemoveTrack.apply(this, arguments);
			var idx = this._senders.indexOf(sender);
			if (idx !== -1) {
			  this._senders.splice(idx, 1);
			}
		  };
		}
		var origAddStream = window.RTCPeerConnection.prototype.addStream;
		window.RTCPeerConnection.prototype.addStream = function addStream(stream) {
		  var _this2 = this;
	
		  this._senders = this._senders || [];
		  origAddStream.apply(this, [stream]);
		  stream.getTracks().forEach(function (track) {
			_this2._senders.push(shimSenderWithDtmf(_this2, track));
		  });
		};
	
		var origRemoveStream = window.RTCPeerConnection.prototype.removeStream;
		window.RTCPeerConnection.prototype.removeStream = function removeStream(stream) {
		  var _this3 = this;
	
		  this._senders = this._senders || [];
		  origRemoveStream.apply(this, [stream]);
	
		  stream.getTracks().forEach(function (track) {
			var sender = _this3._senders.find(function (s) {
			  return s.track === track;
			});
			if (sender) {
			  // remove sender
			  _this3._senders.splice(_this3._senders.indexOf(sender), 1);
			}
		  });
		};
	  } else if ((typeof window === 'undefined' ? 'undefined' : _typeof(window)) === 'object' && window.RTCPeerConnection && 'getSenders' in window.RTCPeerConnection.prototype && 'createDTMFSender' in window.RTCPeerConnection.prototype && window.RTCRtpSender && !('dtmf' in window.RTCRtpSender.prototype)) {
		var origGetSenders = window.RTCPeerConnection.prototype.getSenders;
		window.RTCPeerConnection.prototype.getSenders = function getSenders() {
		  var _this4 = this;
	
		  var senders = origGetSenders.apply(this, []);
		  senders.forEach(function (sender) {
			return sender._pc = _this4;
		  });
		  return senders;
		};
	
		Object.defineProperty(window.RTCRtpSender.prototype, 'dtmf', {
		  get: function get() {
			if (this._dtmf === undefined) {
			  if (this.track.kind === 'audio') {
				this._dtmf = this._pc.createDTMFSender(this.track);
			  } else {
				this._dtmf = null;
			  }
			}
			return this._dtmf;
		  }
		});
	  }
	}
	
	function shimGetStats(window) {
	  if (!window.RTCPeerConnection) {
		return;
	  }
	
	  var origGetStats = window.RTCPeerConnection.prototype.getStats;
	  window.RTCPeerConnection.prototype.getStats = function getStats() {
		var _this5 = this;
	
		var _arguments = Array.prototype.slice.call(arguments),
			selector = _arguments[0],
			onSucc = _arguments[1],
			onErr = _arguments[2];
	
		// If selector is a function then we are in the old style stats so just
		// pass back the original getStats format to avoid breaking old users.
	
	
		if (arguments.length > 0 && typeof selector === 'function') {
		  return origGetStats.apply(this, arguments);
		}
	
		// When spec-style getStats is supported, return those when called with
		// either no arguments or the selector argument is null.
		if (origGetStats.length === 0 && (arguments.length === 0 || typeof selector !== 'function')) {
		  return origGetStats.apply(this, []);
		}
	
		var fixChromeStats_ = function fixChromeStats_(response) {
		  var standardReport = {};
		  var reports = response.result();
		  reports.forEach(function (report) {
			var standardStats = {
			  id: report.id,
			  timestamp: report.timestamp,
			  type: {
				localcandidate: 'local-candidate',
				remotecandidate: 'remote-candidate'
			  }[report.type] || report.type
			};
			report.names().forEach(function (name) {
			  standardStats[name] = report.stat(name);
			});
			standardReport[standardStats.id] = standardStats;
		  });
	
		  return standardReport;
		};
	
		// shim getStats with maplike support
		var makeMapStats = function makeMapStats(stats) {
		  return new Map(Object.keys(stats).map(function (key) {
			return [key, stats[key]];
		  }));
		};
	
		if (arguments.length >= 2) {
		  var successCallbackWrapper_ = function successCallbackWrapper_(response) {
			onSucc(makeMapStats(fixChromeStats_(response)));
		  };
	
		  return origGetStats.apply(this, [successCallbackWrapper_, selector]);
		}
	
		// promise-support
		return new Promise(function (resolve, reject) {
		  origGetStats.apply(_this5, [function (response) {
			resolve(makeMapStats(fixChromeStats_(response)));
		  }, reject]);
		}).then(onSucc, onErr);
	  };
	}
	
	function shimSenderReceiverGetStats(window) {
	  if (!((typeof window === 'undefined' ? 'undefined' : _typeof(window)) === 'object' && window.RTCPeerConnection && window.RTCRtpSender && window.RTCRtpReceiver)) {
		return;
	  }
	
	  // shim sender stats.
	  if (!('getStats' in window.RTCRtpSender.prototype)) {
		var origGetSenders = window.RTCPeerConnection.prototype.getSenders;
		if (origGetSenders) {
		  window.RTCPeerConnection.prototype.getSenders = function getSenders() {
			var _this6 = this;
	
			var senders = origGetSenders.apply(this, []);
			senders.forEach(function (sender) {
			  return sender._pc = _this6;
			});
			return senders;
		  };
		}
	
		var origAddTrack = window.RTCPeerConnection.prototype.addTrack;
		if (origAddTrack) {
		  window.RTCPeerConnection.prototype.addTrack = function addTrack() {
			var sender = origAddTrack.apply(this, arguments);
			sender._pc = this;
			return sender;
		  };
		}
		window.RTCRtpSender.prototype.getStats = function getStats() {
		  var sender = this;
		  return this._pc.getStats().then(function (result) {
			return (
			  /* Note: this will include stats of all senders that
			   *   send a track with the same id as sender.track as
			   *   it is not possible to identify the RTCRtpSender.
			   */
			  utils.filterStats(result, sender.track, true)
			);
		  });
		};
	  }
	
	  // shim receiver stats.
	  if (!('getStats' in window.RTCRtpReceiver.prototype)) {
		var origGetReceivers = window.RTCPeerConnection.prototype.getReceivers;
		if (origGetReceivers) {
		  window.RTCPeerConnection.prototype.getReceivers = function getReceivers() {
			var _this7 = this;
	
			var receivers = origGetReceivers.apply(this, []);
			receivers.forEach(function (receiver) {
			  return receiver._pc = _this7;
			});
			return receivers;
		  };
		}
		utils.wrapPeerConnectionEvent(window, 'track', function (e) {
		  e.receiver._pc = e.srcElement;
		  return e;
		});
		window.RTCRtpReceiver.prototype.getStats = function getStats() {
		  var receiver = this;
		  return this._pc.getStats().then(function (result) {
			return utils.filterStats(result, receiver.track, false);
		  });
		};
	  }
	
	  if (!('getStats' in window.RTCRtpSender.prototype && 'getStats' in window.RTCRtpReceiver.prototype)) {
		return;
	  }
	
	  // shim RTCPeerConnection.getStats(track).
	  var origGetStats = window.RTCPeerConnection.prototype.getStats;
	  window.RTCPeerConnection.prototype.getStats = function getStats() {
		if (arguments.length > 0 && arguments[0] instanceof window.MediaStreamTrack) {
		  var track = arguments[0];
		  var sender = void 0;
		  var receiver = void 0;
		  var err = void 0;
		  this.getSenders().forEach(function (s) {
			if (s.track === track) {
			  if (sender) {
				err = true;
			  } else {
				sender = s;
			  }
			}
		  });
		  this.getReceivers().forEach(function (r) {
			if (r.track === track) {
			  if (receiver) {
				err = true;
			  } else {
				receiver = r;
			  }
			}
			return r.track === track;
		  });
		  if (err || sender && receiver) {
			return Promise.reject(new DOMException('There are more than one sender or receiver for the track.', 'InvalidAccessError'));
		  } else if (sender) {
			return sender.getStats();
		  } else if (receiver) {
			return receiver.getStats();
		  }
		  return Promise.reject(new DOMException('There is no sender or receiver for the track.', 'InvalidAccessError'));
		}
		return origGetStats.apply(this, arguments);
	  };
	}
	
	function shimAddTrackRemoveTrackWithNative(window) {
	  // shim addTrack/removeTrack with native variants in order to make
	  // the interactions with legacy getLocalStreams behave as in other browsers.
	  // Keeps a mapping stream.id => [stream, rtpsenders...]
	  window.RTCPeerConnection.prototype.getLocalStreams = function getLocalStreams() {
		var _this8 = this;
	
		this._shimmedLocalStreams = this._shimmedLocalStreams || {};
		return Object.keys(this._shimmedLocalStreams).map(function (streamId) {
		  return _this8._shimmedLocalStreams[streamId][0];
		});
	  };
	
	  var origAddTrack = window.RTCPeerConnection.prototype.addTrack;
	  window.RTCPeerConnection.prototype.addTrack = function addTrack(track, stream) {
		if (!stream) {
		  return origAddTrack.apply(this, arguments);
		}
		this._shimmedLocalStreams = this._shimmedLocalStreams || {};
	
		var sender = origAddTrack.apply(this, arguments);
		if (!this._shimmedLocalStreams[stream.id]) {
		  this._shimmedLocalStreams[stream.id] = [stream, sender];
		} else if (this._shimmedLocalStreams[stream.id].indexOf(sender) === -1) {
		  this._shimmedLocalStreams[stream.id].push(sender);
		}
		return sender;
	  };
	
	  var origAddStream = window.RTCPeerConnection.prototype.addStream;
	  window.RTCPeerConnection.prototype.addStream = function addStream(stream) {
		var _this9 = this;
	
		this._shimmedLocalStreams = this._shimmedLocalStreams || {};
	
		stream.getTracks().forEach(function (track) {
		  var alreadyExists = _this9.getSenders().find(function (s) {
			return s.track === track;
		  });
		  if (alreadyExists) {
			throw new DOMException('Track already exists.', 'InvalidAccessError');
		  }
		});
		var existingSenders = this.getSenders();
		origAddStream.apply(this, arguments);
		var newSenders = this.getSenders().filter(function (newSender) {
		  return existingSenders.indexOf(newSender) === -1;
		});
		this._shimmedLocalStreams[stream.id] = [stream].concat(newSenders);
	  };
	
	  var origRemoveStream = window.RTCPeerConnection.prototype.removeStream;
	  window.RTCPeerConnection.prototype.removeStream = function removeStream(stream) {
		this._shimmedLocalStreams = this._shimmedLocalStreams || {};
		delete this._shimmedLocalStreams[stream.id];
		return origRemoveStream.apply(this, arguments);
	  };
	
	  var origRemoveTrack = window.RTCPeerConnection.prototype.removeTrack;
	  window.RTCPeerConnection.prototype.removeTrack = function removeTrack(sender) {
		var _this10 = this;
	
		this._shimmedLocalStreams = this._shimmedLocalStreams || {};
		if (sender) {
		  Object.keys(this._shimmedLocalStreams).forEach(function (streamId) {
			var idx = _this10._shimmedLocalStreams[streamId].indexOf(sender);
			if (idx !== -1) {
			  _this10._shimmedLocalStreams[streamId].splice(idx, 1);
			}
			if (_this10._shimmedLocalStreams[streamId].length === 1) {
			  delete _this10._shimmedLocalStreams[streamId];
			}
		  });
		}
		return origRemoveTrack.apply(this, arguments);
	  };
	}
	
	function shimAddTrackRemoveTrack(window, browserDetails) {
	  if (!window.RTCPeerConnection) {
		return;
	  }
	  // shim addTrack and removeTrack.
	  if (window.RTCPeerConnection.prototype.addTrack && browserDetails.version >= 65) {
		return shimAddTrackRemoveTrackWithNative(window);
	  }
	
	  // also shim pc.getLocalStreams when addTrack is shimmed
	  // to return the original streams.
	  var origGetLocalStreams = window.RTCPeerConnection.prototype.getLocalStreams;
	  window.RTCPeerConnection.prototype.getLocalStreams = function getLocalStreams() {
		var _this11 = this;
	
		var nativeStreams = origGetLocalStreams.apply(this);
		this._reverseStreams = this._reverseStreams || {};
		return nativeStreams.map(function (stream) {
		  return _this11._reverseStreams[stream.id];
		});
	  };
	
	  var origAddStream = window.RTCPeerConnection.prototype.addStream;
	  window.RTCPeerConnection.prototype.addStream = function addStream(stream) {
		var _this12 = this;
	
		this._streams = this._streams || {};
		this._reverseStreams = this._reverseStreams || {};
	
		stream.getTracks().forEach(function (track) {
		  var alreadyExists = _this12.getSenders().find(function (s) {
			return s.track === track;
		  });
		  if (alreadyExists) {
			throw new DOMException('Track already exists.', 'InvalidAccessError');
		  }
		});
		// Add identity mapping for consistency with addTrack.
		// Unless this is being used with a stream from addTrack.
		if (!this._reverseStreams[stream.id]) {
		  var newStream = new window.MediaStream(stream.getTracks());
		  this._streams[stream.id] = newStream;
		  this._reverseStreams[newStream.id] = stream;
		  stream = newStream;
		}
		origAddStream.apply(this, [stream]);
	  };
	
	  var origRemoveStream = window.RTCPeerConnection.prototype.removeStream;
	  window.RTCPeerConnection.prototype.removeStream = function removeStream(stream) {
		this._streams = this._streams || {};
		this._reverseStreams = this._reverseStreams || {};
	
		origRemoveStream.apply(this, [this._streams[stream.id] || stream]);
		delete this._reverseStreams[this._streams[stream.id] ? this._streams[stream.id].id : stream.id];
		delete this._streams[stream.id];
	  };
	
	  window.RTCPeerConnection.prototype.addTrack = function addTrack(track, stream) {
		var _this13 = this;
	
		if (this.signalingState === 'closed') {
		  throw new DOMException('The RTCPeerConnection\'s signalingState is \'closed\'.', 'InvalidStateError');
		}
		var streams = [].slice.call(arguments, 1);
		if (streams.length !== 1 || !streams[0].getTracks().find(function (t) {
		  return t === track;
		})) {
		  // this is not fully correct but all we can manage without
		  // [[associated MediaStreams]] internal slot.
		  throw new DOMException('The adapter.js addTrack polyfill only supports a single ' + ' stream which is associated with the specified track.', 'NotSupportedError');
		}
	
		var alreadyExists = this.getSenders().find(function (s) {
		  return s.track === track;
		});
		if (alreadyExists) {
		  throw new DOMException('Track already exists.', 'InvalidAccessError');
		}
	
		this._streams = this._streams || {};
		this._reverseStreams = this._reverseStreams || {};
		var oldStream = this._streams[stream.id];
		if (oldStream) {
		  // this is using odd Chrome behaviour, use with caution:
		  // https://bugs.chromium.org/p/webrtc/issues/detail?id=7815
		  // Note: we rely on the high-level addTrack/dtmf shim to
		  // create the sender with a dtmf sender.
		  oldStream.addTrack(track);
	
		  // Trigger ONN async.
		  Promise.resolve().then(function () {
			_this13.dispatchEvent(new Event('negotiationneeded'));
		  });
		} else {
		  var newStream = new window.MediaStream([track]);
		  this._streams[stream.id] = newStream;
		  this._reverseStreams[newStream.id] = stream;
		  this.addStream(newStream);
		}
		return this.getSenders().find(function (s) {
		  return s.track === track;
		});
	  };
	
	  // replace the internal stream id with the external one and
	  // vice versa.
	  function replaceInternalStreamId(pc, description) {
		var sdp = description.sdp;
		Object.keys(pc._reverseStreams || []).forEach(function (internalId) {
		  var externalStream = pc._reverseStreams[internalId];
		  var internalStream = pc._streams[externalStream.id];
		  sdp = sdp.replace(new RegExp(internalStream.id, 'g'), externalStream.id);
		});
		return new RTCSessionDescription({
		  type: description.type,
		  sdp: sdp
		});
	  }
	  function replaceExternalStreamId(pc, description) {
		var sdp = description.sdp;
		Object.keys(pc._reverseStreams || []).forEach(function (internalId) {
		  var externalStream = pc._reverseStreams[internalId];
		  var internalStream = pc._streams[externalStream.id];
		  sdp = sdp.replace(new RegExp(externalStream.id, 'g'), internalStream.id);
		});
		return new RTCSessionDescription({
		  type: description.type,
		  sdp: sdp
		});
	  }
	  ['createOffer', 'createAnswer'].forEach(function (method) {
		var nativeMethod = window.RTCPeerConnection.prototype[method];
		var methodObj = _defineProperty({}, method, function () {
		  var _this14 = this;
	
		  var args = arguments;
		  var isLegacyCall = arguments.length && typeof arguments[0] === 'function';
		  if (isLegacyCall) {
			return nativeMethod.apply(this, [function (description) {
			  var desc = replaceInternalStreamId(_this14, description);
			  args[0].apply(null, [desc]);
			}, function (err) {
			  if (args[1]) {
				args[1].apply(null, err);
			  }
			}, arguments[2]]);
		  }
		  return nativeMethod.apply(this, arguments).then(function (description) {
			return replaceInternalStreamId(_this14, description);
		  });
		});
		window.RTCPeerConnection.prototype[method] = methodObj[method];
	  });
	
	  var origSetLocalDescription = window.RTCPeerConnection.prototype.setLocalDescription;
	  window.RTCPeerConnection.prototype.setLocalDescription = function setLocalDescription() {
		if (!arguments.length || !arguments[0].type) {
		  return origSetLocalDescription.apply(this, arguments);
		}
		arguments[0] = replaceExternalStreamId(this, arguments[0]);
		return origSetLocalDescription.apply(this, arguments);
	  };
	
	  // TODO: mangle getStats: https://w3c.github.io/webrtc-stats/#dom-rtcmediastreamstats-streamidentifier
	
	  var origLocalDescription = Object.getOwnPropertyDescriptor(window.RTCPeerConnection.prototype, 'localDescription');
	  Object.defineProperty(window.RTCPeerConnection.prototype, 'localDescription', {
		get: function get() {
		  var description = origLocalDescription.get.apply(this);
		  if (description.type === '') {
			return description;
		  }
		  return replaceInternalStreamId(this, description);
		}
	  });
	
	  window.RTCPeerConnection.prototype.removeTrack = function removeTrack(sender) {
		var _this15 = this;
	
		if (this.signalingState === 'closed') {
		  throw new DOMException('The RTCPeerConnection\'s signalingState is \'closed\'.', 'InvalidStateError');
		}
		// We can not yet check for sender instanceof RTCRtpSender
		// since we shim RTPSender. So we check if sender._pc is set.
		if (!sender._pc) {
		  throw new DOMException('Argument 1 of RTCPeerConnection.removeTrack ' + 'does not implement interface RTCRtpSender.', 'TypeError');
		}
		var isLocal = sender._pc === this;
		if (!isLocal) {
		  throw new DOMException('Sender was not created by this connection.', 'InvalidAccessError');
		}
	
		// Search for the native stream the senders track belongs to.
		this._streams = this._streams || {};
		var stream = void 0;
		Object.keys(this._streams).forEach(function (streamid) {
		  var hasTrack = _this15._streams[streamid].getTracks().find(function (track) {
			return sender.track === track;
		  });
		  if (hasTrack) {
			stream = _this15._streams[streamid];
		  }
		});
	
		if (stream) {
		  if (stream.getTracks().length === 1) {
			// if this is the last track of the stream, remove the stream. This
			// takes care of any shimmed _senders.
			this.removeStream(this._reverseStreams[stream.id]);
		  } else {
			// relying on the same odd chrome behaviour as above.
			stream.removeTrack(sender.track);
		  }
		  this.dispatchEvent(new Event('negotiationneeded'));
		}
	  };
	}
	
	function shimPeerConnection(window, browserDetails) {
	  if (!window.RTCPeerConnection && window.webkitRTCPeerConnection) {
		// very basic support for old versions.
		window.RTCPeerConnection = window.webkitRTCPeerConnection;
	  }
	  if (!window.RTCPeerConnection) {
		return;
	  }
	
	  // shim implicit creation of RTCSessionDescription/RTCIceCandidate
	  if (browserDetails.version < 53) {
		['setLocalDescription', 'setRemoteDescription', 'addIceCandidate'].forEach(function (method) {
		  var nativeMethod = window.RTCPeerConnection.prototype[method];
		  var methodObj = _defineProperty({}, method, function () {
			arguments[0] = new (method === 'addIceCandidate' ? window.RTCIceCandidate : window.RTCSessionDescription)(arguments[0]);
			return nativeMethod.apply(this, arguments);
		  });
		  window.RTCPeerConnection.prototype[method] = methodObj[method];
		});
	  }
	}
	
	// Attempt to fix ONN in plan-b mode.
	function fixNegotiationNeeded(window, browserDetails) {
	  utils.wrapPeerConnectionEvent(window, 'negotiationneeded', function (e) {
		var pc = e.target;
		if (browserDetails.version < 72 || pc.getConfiguration && pc.getConfiguration().sdpSemantics === 'plan-b') {
		  if (pc.signalingState !== 'stable') {
			return;
		  }
		}
		return e;
	  });
	}
	
	},{"../utils.js":11,"./getdisplaymedia":4,"./getusermedia":5}],4:[function(require,module,exports){
	/*
	 *  Copyright (c) 2018 The adapter.js project authors. All Rights Reserved.
	 *
	 *  Use of this source code is governed by a BSD-style license
	 *  that can be found in the LICENSE file in the root of the source
	 *  tree.
	 */
	/* eslint-env node */
	'use strict';
	
	Object.defineProperty(exports, "__esModule", {
	  value: true
	});
	exports.shimGetDisplayMedia = shimGetDisplayMedia;
	function shimGetDisplayMedia(window, getSourceId) {
	  if (window.navigator.mediaDevices && 'getDisplayMedia' in window.navigator.mediaDevices) {
		return;
	  }
	  if (!window.navigator.mediaDevices) {
		return;
	  }
	  // getSourceId is a function that returns a promise resolving with
	  // the sourceId of the screen/window/tab to be shared.
	  if (typeof getSourceId !== 'function') {
		console.error('shimGetDisplayMedia: getSourceId argument is not ' + 'a function');
		return;
	  }
	  window.navigator.mediaDevices.getDisplayMedia = function getDisplayMedia(constraints) {
		return getSourceId(constraints).then(function (sourceId) {
		  var widthSpecified = constraints.video && constraints.video.width;
		  var heightSpecified = constraints.video && constraints.video.height;
		  var frameRateSpecified = constraints.video && constraints.video.frameRate;
		  constraints.video = {
			mandatory: {
			  chromeMediaSource: 'desktop',
			  chromeMediaSourceId: sourceId,
			  maxFrameRate: frameRateSpecified || 3
			}
		  };
		  if (widthSpecified) {
			constraints.video.mandatory.maxWidth = widthSpecified;
		  }
		  if (heightSpecified) {
			constraints.video.mandatory.maxHeight = heightSpecified;
		  }
		  return window.navigator.mediaDevices.getUserMedia(constraints);
		});
	  };
	}
	
	},{}],5:[function(require,module,exports){
	/*
	 *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
	 *
	 *  Use of this source code is governed by a BSD-style license
	 *  that can be found in the LICENSE file in the root of the source
	 *  tree.
	 */
	/* eslint-env node */
	'use strict';
	
	Object.defineProperty(exports, "__esModule", {
	  value: true
	});
	
	var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; };
	
	exports.shimGetUserMedia = shimGetUserMedia;
	
	var _utils = require('../utils.js');
	
	var utils = _interopRequireWildcard(_utils);
	
	function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) newObj[key] = obj[key]; } } newObj.default = obj; return newObj; } }
	
	var logging = utils.log;
	
	function shimGetUserMedia(window, browserDetails) {
	  var navigator = window && window.navigator;
	
	  if (!navigator.mediaDevices) {
		return;
	  }
	
	  var constraintsToChrome_ = function constraintsToChrome_(c) {
		if ((typeof c === 'undefined' ? 'undefined' : _typeof(c)) !== 'object' || c.mandatory || c.optional) {
		  return c;
		}
		var cc = {};
		Object.keys(c).forEach(function (key) {
		  if (key === 'require' || key === 'advanced' || key === 'mediaSource') {
			return;
		  }
		  var r = _typeof(c[key]) === 'object' ? c[key] : { ideal: c[key] };
		  if (r.exact !== undefined && typeof r.exact === 'number') {
			r.min = r.max = r.exact;
		  }
		  var oldname_ = function oldname_(prefix, name) {
			if (prefix) {
			  return prefix + name.charAt(0).toUpperCase() + name.slice(1);
			}
			return name === 'deviceId' ? 'sourceId' : name;
		  };
		  if (r.ideal !== undefined) {
			cc.optional = cc.optional || [];
			var oc = {};
			if (typeof r.ideal === 'number') {
			  oc[oldname_('min', key)] = r.ideal;
			  cc.optional.push(oc);
			  oc = {};
			  oc[oldname_('max', key)] = r.ideal;
			  cc.optional.push(oc);
			} else {
			  oc[oldname_('', key)] = r.ideal;
			  cc.optional.push(oc);
			}
		  }
		  if (r.exact !== undefined && typeof r.exact !== 'number') {
			cc.mandatory = cc.mandatory || {};
			cc.mandatory[oldname_('', key)] = r.exact;
		  } else {
			['min', 'max'].forEach(function (mix) {
			  if (r[mix] !== undefined) {
				cc.mandatory = cc.mandatory || {};
				cc.mandatory[oldname_(mix, key)] = r[mix];
			  }
			});
		  }
		});
		if (c.advanced) {
		  cc.optional = (cc.optional || []).concat(c.advanced);
		}
		return cc;
	  };
	
	  var shimConstraints_ = function shimConstraints_(constraints, func) {
		if (browserDetails.version >= 61) {
		  return func(constraints);
		}
		constraints = JSON.parse(JSON.stringify(constraints));
		if (constraints && _typeof(constraints.audio) === 'object') {
		  var remap = function remap(obj, a, b) {
			if (a in obj && !(b in obj)) {
			  obj[b] = obj[a];
			  delete obj[a];
			}
		  };
		  constraints = JSON.parse(JSON.stringify(constraints));
		  remap(constraints.audio, 'autoGainControl', 'googAutoGainControl');
		  remap(constraints.audio, 'noiseSuppression', 'googNoiseSuppression');
		  constraints.audio = constraintsToChrome_(constraints.audio);
		}
		if (constraints && _typeof(constraints.video) === 'object') {
		  // Shim facingMode for mobile & surface pro.
		  var face = constraints.video.facingMode;
		  face = face && ((typeof face === 'undefined' ? 'undefined' : _typeof(face)) === 'object' ? face : { ideal: face });
		  var getSupportedFacingModeLies = browserDetails.version < 66;
	
		  if (face && (face.exact === 'user' || face.exact === 'environment' || face.ideal === 'user' || face.ideal === 'environment') && !(navigator.mediaDevices.getSupportedConstraints && navigator.mediaDevices.getSupportedConstraints().facingMode && !getSupportedFacingModeLies)) {
			delete constraints.video.facingMode;
			var matches = void 0;
			if (face.exact === 'environment' || face.ideal === 'environment') {
			  matches = ['back', 'rear'];
			} else if (face.exact === 'user' || face.ideal === 'user') {
			  matches = ['front'];
			}
			if (matches) {
			  // Look for matches in label, or use last cam for back (typical).
			  return navigator.mediaDevices.enumerateDevices().then(function (devices) {
				devices = devices.filter(function (d) {
				  return d.kind === 'videoinput';
				});
				var dev = devices.find(function (d) {
				  return matches.some(function (match) {
					return d.label.toLowerCase().includes(match);
				  });
				});
				if (!dev && devices.length && matches.includes('back')) {
				  dev = devices[devices.length - 1]; // more likely the back cam
				}
				if (dev) {
				  constraints.video.deviceId = face.exact ? { exact: dev.deviceId } : { ideal: dev.deviceId };
				}
				constraints.video = constraintsToChrome_(constraints.video);
				logging('chrome: ' + JSON.stringify(constraints));
				return func(constraints);
			  });
			}
		  }
		  constraints.video = constraintsToChrome_(constraints.video);
		}
		logging('chrome: ' + JSON.stringify(constraints));
		return func(constraints);
	  };
	
	  var shimError_ = function shimError_(e) {
		if (browserDetails.version >= 64) {
		  return e;
		}
		return {
		  name: {
			PermissionDeniedError: 'NotAllowedError',
			PermissionDismissedError: 'NotAllowedError',
			InvalidStateError: 'NotAllowedError',
			DevicesNotFoundError: 'NotFoundError',
			ConstraintNotSatisfiedError: 'OverconstrainedError',
			TrackStartError: 'NotReadableError',
			MediaDeviceFailedDueToShutdown: 'NotAllowedError',
			MediaDeviceKillSwitchOn: 'NotAllowedError',
			TabCaptureError: 'AbortError',
			ScreenCaptureError: 'AbortError',
			DeviceCaptureError: 'AbortError'
		  }[e.name] || e.name,
		  message: e.message,
		  constraint: e.constraint || e.constraintName,
		  toString: function toString() {
			return this.name + (this.message && ': ') + this.message;
		  }
		};
	  };
	
	  var getUserMedia_ = function getUserMedia_(constraints, onSuccess, onError) {
		shimConstraints_(constraints, function (c) {
		  navigator.webkitGetUserMedia(c, onSuccess, function (e) {
			if (onError) {
			  onError(shimError_(e));
			}
		  });
		});
	  };
	  navigator.getUserMedia = getUserMedia_.bind(navigator);
	
	  // Even though Chrome 45 has navigator.mediaDevices and a getUserMedia
	  // function which returns a Promise, it does not accept spec-style
	  // constraints.
	  if (navigator.mediaDevices.getUserMedia) {
		var origGetUserMedia = navigator.mediaDevices.getUserMedia.bind(navigator.mediaDevices);
		navigator.mediaDevices.getUserMedia = function (cs) {
		  return shimConstraints_(cs, function (c) {
			return origGetUserMedia(c).then(function (stream) {
			  if (c.audio && !stream.getAudioTracks().length || c.video && !stream.getVideoTracks().length) {
				stream.getTracks().forEach(function (track) {
				  track.stop();
				});
				throw new DOMException('', 'NotFoundError');
			  }
			  return stream;
			}, function (e) {
			  return Promise.reject(shimError_(e));
			});
		  });
		};
	  }
	}
	
	},{"../utils.js":11}],6:[function(require,module,exports){
	/*
	 *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
	 *
	 *  Use of this source code is governed by a BSD-style license
	 *  that can be found in the LICENSE file in the root of the source
	 *  tree.
	 */
	/* eslint-env node */
	'use strict';
	
	Object.defineProperty(exports, "__esModule", {
	  value: true
	});
	
	var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; };
	
	exports.shimRTCIceCandidate = shimRTCIceCandidate;
	exports.shimMaxMessageSize = shimMaxMessageSize;
	exports.shimSendThrowTypeError = shimSendThrowTypeError;
	exports.shimConnectionState = shimConnectionState;
	exports.removeExtmapAllowMixed = removeExtmapAllowMixed;
	exports.shimAddIceCandidateNullOrEmpty = shimAddIceCandidateNullOrEmpty;
	
	var _sdp = require('sdp');
	
	var _sdp2 = _interopRequireDefault(_sdp);
	
	var _utils = require('./utils');
	
	var utils = _interopRequireWildcard(_utils);
	
	function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) newObj[key] = obj[key]; } } newObj.default = obj; return newObj; } }
	
	function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
	
	function shimRTCIceCandidate(window) {
	  // foundation is arbitrarily chosen as an indicator for full support for
	  // https://w3c.github.io/webrtc-pc/#rtcicecandidate-interface
	  if (!window.RTCIceCandidate || window.RTCIceCandidate && 'foundation' in window.RTCIceCandidate.prototype) {
		return;
	  }
	
	  var NativeRTCIceCandidate = window.RTCIceCandidate;
	  window.RTCIceCandidate = function RTCIceCandidate(args) {
		// Remove the a= which shouldn't be part of the candidate string.
		if ((typeof args === 'undefined' ? 'undefined' : _typeof(args)) === 'object' && args.candidate && args.candidate.indexOf('a=') === 0) {
		  args = JSON.parse(JSON.stringify(args));
		  args.candidate = args.candidate.substr(2);
		}
	
		if (args.candidate && args.candidate.length) {
		  // Augment the native candidate with the parsed fields.
		  var nativeCandidate = new NativeRTCIceCandidate(args);
		  var parsedCandidate = _sdp2.default.parseCandidate(args.candidate);
		  var augmentedCandidate = Object.assign(nativeCandidate, parsedCandidate);
	
		  // Add a serializer that does not serialize the extra attributes.
		  augmentedCandidate.toJSON = function toJSON() {
			return {
			  candidate: augmentedCandidate.candidate,
			  sdpMid: augmentedCandidate.sdpMid,
			  sdpMLineIndex: augmentedCandidate.sdpMLineIndex,
			  usernameFragment: augmentedCandidate.usernameFragment
			};
		  };
		  return augmentedCandidate;
		}
		return new NativeRTCIceCandidate(args);
	  };
	  window.RTCIceCandidate.prototype = NativeRTCIceCandidate.prototype;
	
	  // Hook up the augmented candidate in onicecandidate and
	  // addEventListener('icecandidate', ...)
	  utils.wrapPeerConnectionEvent(window, 'icecandidate', function (e) {
		if (e.candidate) {
		  Object.defineProperty(e, 'candidate', {
			value: new window.RTCIceCandidate(e.candidate),
			writable: 'false'
		  });
		}
		return e;
	  });
	}
	
	function shimMaxMessageSize(window, browserDetails) {
	  if (!window.RTCPeerConnection) {
		return;
	  }
	
	  if (!('sctp' in window.RTCPeerConnection.prototype)) {
		Object.defineProperty(window.RTCPeerConnection.prototype, 'sctp', {
		  get: function get() {
			return typeof this._sctp === 'undefined' ? null : this._sctp;
		  }
		});
	  }
	
	  var sctpInDescription = function sctpInDescription(description) {
		if (!description || !description.sdp) {
		  return false;
		}
		var sections = _sdp2.default.splitSections(description.sdp);
		sections.shift();
		return sections.some(function (mediaSection) {
		  var mLine = _sdp2.default.parseMLine(mediaSection);
		  return mLine && mLine.kind === 'application' && mLine.protocol.indexOf('SCTP') !== -1;
		});
	  };
	
	  var getRemoteFirefoxVersion = function getRemoteFirefoxVersion(description) {
		// TODO: Is there a better solution for detecting Firefox?
		var match = description.sdp.match(/mozilla...THIS_IS_SDPARTA-(\d+)/);
		if (match === null || match.length < 2) {
		  return -1;
		}
		var version = parseInt(match[1], 10);
		// Test for NaN (yes, this is ugly)
		return version !== version ? -1 : version;
	  };
	
	  var getCanSendMaxMessageSize = function getCanSendMaxMessageSize(remoteIsFirefox) {
		// Every implementation we know can send at least 64 KiB.
		// Note: Although Chrome is technically able to send up to 256 KiB, the
		//       data does not reach the other peer reliably.
		//       See: https://bugs.chromium.org/p/webrtc/issues/detail?id=8419
		var canSendMaxMessageSize = 65536;
		if (browserDetails.browser === 'firefox') {
		  if (browserDetails.version < 57) {
			if (remoteIsFirefox === -1) {
			  // FF < 57 will send in 16 KiB chunks using the deprecated PPID
			  // fragmentation.
			  canSendMaxMessageSize = 16384;
			} else {
			  // However, other FF (and RAWRTC) can reassemble PPID-fragmented
			  // messages. Thus, supporting ~2 GiB when sending.
			  canSendMaxMessageSize = 2147483637;
			}
		  } else if (browserDetails.version < 60) {
			// Currently, all FF >= 57 will reset the remote maximum message size
			// to the default value when a data channel is created at a later
			// stage. :(
			// See: https://bugzilla.mozilla.org/show_bug.cgi?id=1426831
			canSendMaxMessageSize = browserDetails.version === 57 ? 65535 : 65536;
		  } else {
			// FF >= 60 supports sending ~2 GiB
			canSendMaxMessageSize = 2147483637;
		  }
		}
		return canSendMaxMessageSize;
	  };
	
	  var getMaxMessageSize = function getMaxMessageSize(description, remoteIsFirefox) {
		// Note: 65536 bytes is the default value from the SDP spec. Also,
		//       every implementation we know supports receiving 65536 bytes.
		var maxMessageSize = 65536;
	
		// FF 57 has a slightly incorrect default remote max message size, so
		// we need to adjust it here to avoid a failure when sending.
		// See: https://bugzilla.mozilla.org/show_bug.cgi?id=1425697
		if (browserDetails.browser === 'firefox' && browserDetails.version === 57) {
		  maxMessageSize = 65535;
		}
	
		var match = _sdp2.default.matchPrefix(description.sdp, 'a=max-message-size:');
		if (match.length > 0) {
		  maxMessageSize = parseInt(match[0].substr(19), 10);
		} else if (browserDetails.browser === 'firefox' && remoteIsFirefox !== -1) {
		  // If the maximum message size is not present in the remote SDP and
		  // both local and remote are Firefox, the remote peer can receive
		  // ~2 GiB.
		  maxMessageSize = 2147483637;
		}
		return maxMessageSize;
	  };
	
	  var origSetRemoteDescription = window.RTCPeerConnection.prototype.setRemoteDescription;
	  window.RTCPeerConnection.prototype.setRemoteDescription = function setRemoteDescription() {
		this._sctp = null;
		// Chrome decided to not expose .sctp in plan-b mode.
		// As usual, adapter.js has to do an 'ugly worakaround'
		// to cover up the mess.
		if (browserDetails.browser === 'chrome' && browserDetails.version >= 76) {
		  var _getConfiguration = this.getConfiguration(),
			  sdpSemantics = _getConfiguration.sdpSemantics;
	
		  if (sdpSemantics === 'plan-b') {
			Object.defineProperty(this, 'sctp', {
			  get: function get() {
				return typeof this._sctp === 'undefined' ? null : this._sctp;
			  },
	
			  enumerable: true,
			  configurable: true
			});
		  }
		}
	
		if (sctpInDescription(arguments[0])) {
		  // Check if the remote is FF.
		  var isFirefox = getRemoteFirefoxVersion(arguments[0]);
	
		  // Get the maximum message size the local peer is capable of sending
		  var canSendMMS = getCanSendMaxMessageSize(isFirefox);
	
		  // Get the maximum message size of the remote peer.
		  var remoteMMS = getMaxMessageSize(arguments[0], isFirefox);
	
		  // Determine final maximum message size
		  var maxMessageSize = void 0;
		  if (canSendMMS === 0 && remoteMMS === 0) {
			maxMessageSize = Number.POSITIVE_INFINITY;
		  } else if (canSendMMS === 0 || remoteMMS === 0) {
			maxMessageSize = Math.max(canSendMMS, remoteMMS);
		  } else {
			maxMessageSize = Math.min(canSendMMS, remoteMMS);
		  }
	
		  // Create a dummy RTCSctpTransport object and the 'maxMessageSize'
		  // attribute.
		  var sctp = {};
		  Object.defineProperty(sctp, 'maxMessageSize', {
			get: function get() {
			  return maxMessageSize;
			}
		  });
		  this._sctp = sctp;
		}
	
		return origSetRemoteDescription.apply(this, arguments);
	  };
	}
	
	function shimSendThrowTypeError(window) {
	  if (!(window.RTCPeerConnection && 'createDataChannel' in window.RTCPeerConnection.prototype)) {
		return;
	  }
	
	  // Note: Although Firefox >= 57 has a native implementation, the maximum
	  //       message size can be reset for all data channels at a later stage.
	  //       See: https://bugzilla.mozilla.org/show_bug.cgi?id=1426831
	
	  function wrapDcSend(dc, pc) {
		var origDataChannelSend = dc.send;
		dc.send = function send() {
		  var data = arguments[0];
		  var length = data.length || data.size || data.byteLength;
		  if (dc.readyState === 'open' && pc.sctp && length > pc.sctp.maxMessageSize) {
			throw new TypeError('Message too large (can send a maximum of ' + pc.sctp.maxMessageSize + ' bytes)');
		  }
		  return origDataChannelSend.apply(dc, arguments);
		};
	  }
	  var origCreateDataChannel = window.RTCPeerConnection.prototype.createDataChannel;
	  window.RTCPeerConnection.prototype.createDataChannel = function createDataChannel() {
		var dataChannel = origCreateDataChannel.apply(this, arguments);
		wrapDcSend(dataChannel, this);
		return dataChannel;
	  };
	  utils.wrapPeerConnectionEvent(window, 'datachannel', function (e) {
		wrapDcSend(e.channel, e.target);
		return e;
	  });
	}
	
	/* shims RTCConnectionState by pretending it is the same as iceConnectionState.
	 * See https://bugs.chromium.org/p/webrtc/issues/detail?id=6145#c12
	 * for why this is a valid hack in Chrome. In Firefox it is slightly incorrect
	 * since DTLS failures would be hidden. See
	 * https://bugzilla.mozilla.org/show_bug.cgi?id=1265827
	 * for the Firefox tracking bug.
	 */
	function shimConnectionState(window) {
	  if (!window.RTCPeerConnection || 'connectionState' in window.RTCPeerConnection.prototype) {
		return;
	  }
	  var proto = window.RTCPeerConnection.prototype;
	  Object.defineProperty(proto, 'connectionState', {
		get: function get() {
		  return {
			completed: 'connected',
			checking: 'connecting'
		  }[this.iceConnectionState] || this.iceConnectionState;
		},
	
		enumerable: true,
		configurable: true
	  });
	  Object.defineProperty(proto, 'onconnectionstatechange', {
		get: function get() {
		  return this._onconnectionstatechange || null;
		},
		set: function set(cb) {
		  if (this._onconnectionstatechange) {
			this.removeEventListener('connectionstatechange', this._onconnectionstatechange);
			delete this._onconnectionstatechange;
		  }
		  if (cb) {
			this.addEventListener('connectionstatechange', this._onconnectionstatechange = cb);
		  }
		},
	
		enumerable: true,
		configurable: true
	  });
	
	  ['setLocalDescription', 'setRemoteDescription'].forEach(function (method) {
		var origMethod = proto[method];
		proto[method] = function () {
		  if (!this._connectionstatechangepoly) {
			this._connectionstatechangepoly = function (e) {
			  var pc = e.target;
			  if (pc._lastConnectionState !== pc.connectionState) {
				pc._lastConnectionState = pc.connectionState;
				var newEvent = new Event('connectionstatechange', e);
				pc.dispatchEvent(newEvent);
			  }
			  return e;
			};
			this.addEventListener('iceconnectionstatechange', this._connectionstatechangepoly);
		  }
		  return origMethod.apply(this, arguments);
		};
	  });
	}
	
	function removeExtmapAllowMixed(window, browserDetails) {
	  /* remove a=extmap-allow-mixed for webrtc.org < M71 */
	  if (!window.RTCPeerConnection) {
		return;
	  }
	  if (browserDetails.browser === 'chrome' && browserDetails.version >= 71) {
		return;
	  }
	  if (browserDetails.browser === 'safari' && browserDetails.version >= 605) {
		return;
	  }
	  var nativeSRD = window.RTCPeerConnection.prototype.setRemoteDescription;
	  window.RTCPeerConnection.prototype.setRemoteDescription = function setRemoteDescription(desc) {
		if (desc && desc.sdp && desc.sdp.indexOf('\na=extmap-allow-mixed') !== -1) {
		  var sdp = desc.sdp.split('\n').filter(function (line) {
			return line.trim() !== 'a=extmap-allow-mixed';
		  }).join('\n');
		  // Safari enforces read-only-ness of RTCSessionDescription fields.
		  if (window.RTCSessionDescription && desc instanceof window.RTCSessionDescription) {
			arguments[0] = new window.RTCSessionDescription({
			  type: desc.type,
			  sdp: sdp
			});
		  } else {
			desc.sdp = sdp;
		  }
		}
		return nativeSRD.apply(this, arguments);
	  };
	}
	
	function shimAddIceCandidateNullOrEmpty(window, browserDetails) {
	  // Support for addIceCandidate(null or undefined)
	  // as well as addIceCandidate({candidate: "", ...})
	  // https://bugs.chromium.org/p/chromium/issues/detail?id=978582
	  // Note: must be called before other polyfills which change the signature.
	  if (!(window.RTCPeerConnection && window.RTCPeerConnection.prototype)) {
		return;
	  }
	  var nativeAddIceCandidate = window.RTCPeerConnection.prototype.addIceCandidate;
	  if (!nativeAddIceCandidate || nativeAddIceCandidate.length === 0) {
		return;
	  }
	  window.RTCPeerConnection.prototype.addIceCandidate = function addIceCandidate() {
		if (!arguments[0]) {
		  if (arguments[1]) {
			arguments[1].apply(null);
		  }
		  return Promise.resolve();
		}
		// Firefox 68+ emits and processes {candidate: "", ...}, ignore
		// in older versions.
		// Native support for ignoring exists for Chrome M77+.
		// Safari ignores as well, exact version unknown but works in the same
		// version that also ignores addIceCandidate(null).
		if ((browserDetails.browser === 'chrome' && browserDetails.version < 78 || browserDetails.browser === 'firefox' && browserDetails.version < 68 || browserDetails.browser === 'safari') && arguments[0] && arguments[0].candidate === '') {
		  return Promise.resolve();
		}
		return nativeAddIceCandidate.apply(this, arguments);
	  };
	}
	
	},{"./utils":11,"sdp":12}],7:[function(require,module,exports){
	/*
	 *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
	 *
	 *  Use of this source code is governed by a BSD-style license
	 *  that can be found in the LICENSE file in the root of the source
	 *  tree.
	 */
	/* eslint-env node */
	'use strict';
	
	Object.defineProperty(exports, "__esModule", {
	  value: true
	});
	exports.shimGetDisplayMedia = exports.shimGetUserMedia = undefined;
	
	var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; };
	
	var _getusermedia = require('./getusermedia');
	
	Object.defineProperty(exports, 'shimGetUserMedia', {
	  enumerable: true,
	  get: function get() {
		return _getusermedia.shimGetUserMedia;
	  }
	});
	
	var _getdisplaymedia = require('./getdisplaymedia');
	
	Object.defineProperty(exports, 'shimGetDisplayMedia', {
	  enumerable: true,
	  get: function get() {
		return _getdisplaymedia.shimGetDisplayMedia;
	  }
	});
	exports.shimOnTrack = shimOnTrack;
	exports.shimPeerConnection = shimPeerConnection;
	exports.shimSenderGetStats = shimSenderGetStats;
	exports.shimReceiverGetStats = shimReceiverGetStats;
	exports.shimRemoveStream = shimRemoveStream;
	exports.shimRTCDataChannel = shimRTCDataChannel;
	exports.shimAddTransceiver = shimAddTransceiver;
	exports.shimGetParameters = shimGetParameters;
	exports.shimCreateOffer = shimCreateOffer;
	exports.shimCreateAnswer = shimCreateAnswer;
	
	var _utils = require('../utils');
	
	var utils = _interopRequireWildcard(_utils);
	
	function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) newObj[key] = obj[key]; } } newObj.default = obj; return newObj; } }
	
	function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
	
	function shimOnTrack(window) {
	  if ((typeof window === 'undefined' ? 'undefined' : _typeof(window)) === 'object' && window.RTCTrackEvent && 'receiver' in window.RTCTrackEvent.prototype && !('transceiver' in window.RTCTrackEvent.prototype)) {
		Object.defineProperty(window.RTCTrackEvent.prototype, 'transceiver', {
		  get: function get() {
			return { receiver: this.receiver };
		  }
		});
	  }
	}
	
	function shimPeerConnection(window, browserDetails) {
	  if ((typeof window === 'undefined' ? 'undefined' : _typeof(window)) !== 'object' || !(window.RTCPeerConnection || window.mozRTCPeerConnection)) {
		return; // probably media.peerconnection.enabled=false in about:config
	  }
	  if (!window.RTCPeerConnection && window.mozRTCPeerConnection) {
		// very basic support for old versions.
		window.RTCPeerConnection = window.mozRTCPeerConnection;
	  }
	
	  if (browserDetails.version < 53) {
		// shim away need for obsolete RTCIceCandidate/RTCSessionDescription.
		['setLocalDescription', 'setRemoteDescription', 'addIceCandidate'].forEach(function (method) {
		  var nativeMethod = window.RTCPeerConnection.prototype[method];
		  var methodObj = _defineProperty({}, method, function () {
			arguments[0] = new (method === 'addIceCandidate' ? window.RTCIceCandidate : window.RTCSessionDescription)(arguments[0]);
			return nativeMethod.apply(this, arguments);
		  });
		  window.RTCPeerConnection.prototype[method] = methodObj[method];
		});
	  }
	
	  var modernStatsTypes = {
		inboundrtp: 'inbound-rtp',
		outboundrtp: 'outbound-rtp',
		candidatepair: 'candidate-pair',
		localcandidate: 'local-candidate',
		remotecandidate: 'remote-candidate'
	  };
	
	  var nativeGetStats = window.RTCPeerConnection.prototype.getStats;
	  window.RTCPeerConnection.prototype.getStats = function getStats() {
		var _arguments = Array.prototype.slice.call(arguments),
			selector = _arguments[0],
			onSucc = _arguments[1],
			onErr = _arguments[2];
	
		return nativeGetStats.apply(this, [selector || null]).then(function (stats) {
		  if (browserDetails.version < 53 && !onSucc) {
			// Shim only promise getStats with spec-hyphens in type names
			// Leave callback version alone; misc old uses of forEach before Map
			try {
			  stats.forEach(function (stat) {
				stat.type = modernStatsTypes[stat.type] || stat.type;
			  });
			} catch (e) {
			  if (e.name !== 'TypeError') {
				throw e;
			  }
			  // Avoid TypeError: "type" is read-only, in old versions. 34-43ish
			  stats.forEach(function (stat, i) {
				stats.set(i, Object.assign({}, stat, {
				  type: modernStatsTypes[stat.type] || stat.type
				}));
			  });
			}
		  }
		  return stats;
		}).then(onSucc, onErr);
	  };
	}
	
	function shimSenderGetStats(window) {
	  if (!((typeof window === 'undefined' ? 'undefined' : _typeof(window)) === 'object' && window.RTCPeerConnection && window.RTCRtpSender)) {
		return;
	  }
	  if (window.RTCRtpSender && 'getStats' in window.RTCRtpSender.prototype) {
		return;
	  }
	  var origGetSenders = window.RTCPeerConnection.prototype.getSenders;
	  if (origGetSenders) {
		window.RTCPeerConnection.prototype.getSenders = function getSenders() {
		  var _this = this;
	
		  var senders = origGetSenders.apply(this, []);
		  senders.forEach(function (sender) {
			return sender._pc = _this;
		  });
		  return senders;
		};
	  }
	
	  var origAddTrack = window.RTCPeerConnection.prototype.addTrack;
	  if (origAddTrack) {
		window.RTCPeerConnection.prototype.addTrack = function addTrack() {
		  var sender = origAddTrack.apply(this, arguments);
		  sender._pc = this;
		  return sender;
		};
	  }
	  window.RTCRtpSender.prototype.getStats = function getStats() {
		return this.track ? this._pc.getStats(this.track) : Promise.resolve(new Map());
	  };
	}
	
	function shimReceiverGetStats(window) {
	  if (!((typeof window === 'undefined' ? 'undefined' : _typeof(window)) === 'object' && window.RTCPeerConnection && window.RTCRtpSender)) {
		return;
	  }
	  if (window.RTCRtpSender && 'getStats' in window.RTCRtpReceiver.prototype) {
		return;
	  }
	  var origGetReceivers = window.RTCPeerConnection.prototype.getReceivers;
	  if (origGetReceivers) {
		window.RTCPeerConnection.prototype.getReceivers = function getReceivers() {
		  var _this2 = this;
	
		  var receivers = origGetReceivers.apply(this, []);
		  receivers.forEach(function (receiver) {
			return receiver._pc = _this2;
		  });
		  return receivers;
		};
	  }
	  utils.wrapPeerConnectionEvent(window, 'track', function (e) {
		e.receiver._pc = e.srcElement;
		return e;
	  });
	  window.RTCRtpReceiver.prototype.getStats = function getStats() {
		return this._pc.getStats(this.track);
	  };
	}
	
	function shimRemoveStream(window) {
	  if (!window.RTCPeerConnection || 'removeStream' in window.RTCPeerConnection.prototype) {
		return;
	  }
	  window.RTCPeerConnection.prototype.removeStream = function removeStream(stream) {
		var _this3 = this;
	
		utils.deprecated('removeStream', 'removeTrack');
		this.getSenders().forEach(function (sender) {
		  if (sender.track && stream.getTracks().includes(sender.track)) {
			_this3.removeTrack(sender);
		  }
		});
	  };
	}
	
	function shimRTCDataChannel(window) {
	  // rename DataChannel to RTCDataChannel (native fix in FF60):
	  // https://bugzilla.mozilla.org/show_bug.cgi?id=1173851
	  if (window.DataChannel && !window.RTCDataChannel) {
		window.RTCDataChannel = window.DataChannel;
	  }
	}
	
	function shimAddTransceiver(window) {
	  // https://github.com/webrtcHacks/adapter/issues/998#issuecomment-516921647
	  // Firefox ignores the init sendEncodings options passed to addTransceiver
	  // https://bugzilla.mozilla.org/show_bug.cgi?id=1396918
	  if (!((typeof window === 'undefined' ? 'undefined' : _typeof(window)) === 'object' && window.RTCPeerConnection)) {
		return;
	  }
	  var origAddTransceiver = window.RTCPeerConnection.prototype.addTransceiver;
	  if (origAddTransceiver) {
		window.RTCPeerConnection.prototype.addTransceiver = function addTransceiver() {
		  this.setParametersPromises = [];
		  var initParameters = arguments[1];
		  var shouldPerformCheck = initParameters && 'sendEncodings' in initParameters;
		  if (shouldPerformCheck) {
			// If sendEncodings params are provided, validate grammar
			initParameters.sendEncodings.forEach(function (encodingParam) {
			  if ('rid' in encodingParam) {
				var ridRegex = /^[a-z0-9]{0,16}$/i;
				if (!ridRegex.test(encodingParam.rid)) {
				  throw new TypeError('Invalid RID value provided.');
				}
			  }
			  if ('scaleResolutionDownBy' in encodingParam) {
				if (!(parseFloat(encodingParam.scaleResolutionDownBy) >= 1.0)) {
				  throw new RangeError('scale_resolution_down_by must be >= 1.0');
				}
			  }
			  if ('maxFramerate' in encodingParam) {
				if (!(parseFloat(encodingParam.maxFramerate) >= 0)) {
				  throw new RangeError('max_framerate must be >= 0.0');
				}
			  }
			});
		  }
		  var transceiver = origAddTransceiver.apply(this, arguments);
		  if (shouldPerformCheck) {
			// Check if the init options were applied. If not we do this in an
			// asynchronous way and save the promise reference in a global object.
			// This is an ugly hack, but at the same time is way more robust than
			// checking the sender parameters before and after the createOffer
			// Also note that after the createoffer we are not 100% sure that
			// the params were asynchronously applied so we might miss the
			// opportunity to recreate offer.
			var sender = transceiver.sender;
	
			var params = sender.getParameters();
			if (!('encodings' in params) ||
			// Avoid being fooled by patched getParameters() below.
			params.encodings.length === 1 && Object.keys(params.encodings[0]).length === 0) {
			  params.encodings = initParameters.sendEncodings;
			  sender.sendEncodings = initParameters.sendEncodings;
			  this.setParametersPromises.push(sender.setParameters(params).then(function () {
				delete sender.sendEncodings;
			  }).catch(function () {
				delete sender.sendEncodings;
			  }));
			}
		  }
		  return transceiver;
		};
	  }
	}
	
	function shimGetParameters(window) {
	  if (!((typeof window === 'undefined' ? 'undefined' : _typeof(window)) === 'object' && window.RTCRtpSender)) {
		return;
	  }
	  var origGetParameters = window.RTCRtpSender.prototype.getParameters;
	  if (origGetParameters) {
		window.RTCRtpSender.prototype.getParameters = function getParameters() {
		  var params = origGetParameters.apply(this, arguments);
		  if (!('encodings' in params)) {
			params.encodings = [].concat(this.sendEncodings || [{}]);
		  }
		  return params;
		};
	  }
	}
	
	function shimCreateOffer(window) {
	  // https://github.com/webrtcHacks/adapter/issues/998#issuecomment-516921647
	  // Firefox ignores the init sendEncodings options passed to addTransceiver
	  // https://bugzilla.mozilla.org/show_bug.cgi?id=1396918
	  if (!((typeof window === 'undefined' ? 'undefined' : _typeof(window)) === 'object' && window.RTCPeerConnection)) {
		return;
	  }
	  var origCreateOffer = window.RTCPeerConnection.prototype.createOffer;
	  window.RTCPeerConnection.prototype.createOffer = function createOffer() {
		var _this4 = this,
			_arguments2 = arguments;
	
		if (this.setParametersPromises && this.setParametersPromises.length) {
		  return Promise.all(this.setParametersPromises).then(function () {
			return origCreateOffer.apply(_this4, _arguments2);
		  }).finally(function () {
			_this4.setParametersPromises = [];
		  });
		}
		return origCreateOffer.apply(this, arguments);
	  };
	}
	
	function shimCreateAnswer(window) {
	  // https://github.com/webrtcHacks/adapter/issues/998#issuecomment-516921647
	  // Firefox ignores the init sendEncodings options passed to addTransceiver
	  // https://bugzilla.mozilla.org/show_bug.cgi?id=1396918
	  if (!((typeof window === 'undefined' ? 'undefined' : _typeof(window)) === 'object' && window.RTCPeerConnection)) {
		return;
	  }
	  var origCreateAnswer = window.RTCPeerConnection.prototype.createAnswer;
	  window.RTCPeerConnection.prototype.createAnswer = function createAnswer() {
		var _this5 = this,
			_arguments3 = arguments;
	
		if (this.setParametersPromises && this.setParametersPromises.length) {
		  return Promise.all(this.setParametersPromises).then(function () {
			return origCreateAnswer.apply(_this5, _arguments3);
		  }).finally(function () {
			_this5.setParametersPromises = [];
		  });
		}
		return origCreateAnswer.apply(this, arguments);
	  };
	}
	
	},{"../utils":11,"./getdisplaymedia":8,"./getusermedia":9}],8:[function(require,module,exports){
	/*
	 *  Copyright (c) 2018 The adapter.js project authors. All Rights Reserved.
	 *
	 *  Use of this source code is governed by a BSD-style license
	 *  that can be found in the LICENSE file in the root of the source
	 *  tree.
	 */
	/* eslint-env node */
	'use strict';
	
	Object.defineProperty(exports, "__esModule", {
	  value: true
	});
	exports.shimGetDisplayMedia = shimGetDisplayMedia;
	function shimGetDisplayMedia(window, preferredMediaSource) {
	  if (window.navigator.mediaDevices && 'getDisplayMedia' in window.navigator.mediaDevices) {
		return;
	  }
	  if (!window.navigator.mediaDevices) {
		return;
	  }
	  window.navigator.mediaDevices.getDisplayMedia = function getDisplayMedia(constraints) {
		if (!(constraints && constraints.video)) {
		  var err = new DOMException('getDisplayMedia without video ' + 'constraints is undefined');
		  err.name = 'NotFoundError';
		  // from https://heycam.github.io/webidl/#idl-DOMException-error-names
		  err.code = 8;
		  return Promise.reject(err);
		}
		if (constraints.video === true) {
		  constraints.video = { mediaSource: preferredMediaSource };
		} else {
		  constraints.video.mediaSource = preferredMediaSource;
		}
		return window.navigator.mediaDevices.getUserMedia(constraints);
	  };
	}
	
	},{}],9:[function(require,module,exports){
	/*
	 *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
	 *
	 *  Use of this source code is governed by a BSD-style license
	 *  that can be found in the LICENSE file in the root of the source
	 *  tree.
	 */
	/* eslint-env node */
	'use strict';
	
	Object.defineProperty(exports, "__esModule", {
	  value: true
	});
	
	var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; };
	
	exports.shimGetUserMedia = shimGetUserMedia;
	
	var _utils = require('../utils');
	
	var utils = _interopRequireWildcard(_utils);
	
	function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) newObj[key] = obj[key]; } } newObj.default = obj; return newObj; } }
	
	function shimGetUserMedia(window, browserDetails) {
	  var navigator = window && window.navigator;
	  var MediaStreamTrack = window && window.MediaStreamTrack;
	
	  navigator.getUserMedia = function (constraints, onSuccess, onError) {
		// Replace Firefox 44+'s deprecation warning with unprefixed version.
		utils.deprecated('navigator.getUserMedia', 'navigator.mediaDevices.getUserMedia');
		navigator.mediaDevices.getUserMedia(constraints).then(onSuccess, onError);
	  };
	
	  if (!(browserDetails.version > 55 && 'autoGainControl' in navigator.mediaDevices.getSupportedConstraints())) {
		var remap = function remap(obj, a, b) {
		  if (a in obj && !(b in obj)) {
			obj[b] = obj[a];
			delete obj[a];
		  }
		};
	
		var nativeGetUserMedia = navigator.mediaDevices.getUserMedia.bind(navigator.mediaDevices);
		navigator.mediaDevices.getUserMedia = function (c) {
		  if ((typeof c === 'undefined' ? 'undefined' : _typeof(c)) === 'object' && _typeof(c.audio) === 'object') {
			c = JSON.parse(JSON.stringify(c));
			remap(c.audio, 'autoGainControl', 'mozAutoGainControl');
			remap(c.audio, 'noiseSuppression', 'mozNoiseSuppression');
		  }
		  return nativeGetUserMedia(c);
		};
	
		if (MediaStreamTrack && MediaStreamTrack.prototype.getSettings) {
		  var nativeGetSettings = MediaStreamTrack.prototype.getSettings;
		  MediaStreamTrack.prototype.getSettings = function () {
			var obj = nativeGetSettings.apply(this, arguments);
			remap(obj, 'mozAutoGainControl', 'autoGainControl');
			remap(obj, 'mozNoiseSuppression', 'noiseSuppression');
			return obj;
		  };
		}
	
		if (MediaStreamTrack && MediaStreamTrack.prototype.applyConstraints) {
		  var nativeApplyConstraints = MediaStreamTrack.prototype.applyConstraints;
		  MediaStreamTrack.prototype.applyConstraints = function (c) {
			if (this.kind === 'audio' && (typeof c === 'undefined' ? 'undefined' : _typeof(c)) === 'object') {
			  c = JSON.parse(JSON.stringify(c));
			  remap(c, 'autoGainControl', 'mozAutoGainControl');
			  remap(c, 'noiseSuppression', 'mozNoiseSuppression');
			}
			return nativeApplyConstraints.apply(this, [c]);
		  };
		}
	  }
	}
	
	},{"../utils":11}],10:[function(require,module,exports){
	/*
	 *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
	 *
	 *  Use of this source code is governed by a BSD-style license
	 *  that can be found in the LICENSE file in the root of the source
	 *  tree.
	 */
	'use strict';
	
	Object.defineProperty(exports, "__esModule", {
	  value: true
	});
	
	var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; };
	
	exports.shimLocalStreamsAPI = shimLocalStreamsAPI;
	exports.shimRemoteStreamsAPI = shimRemoteStreamsAPI;
	exports.shimCallbacksAPI = shimCallbacksAPI;
	exports.shimGetUserMedia = shimGetUserMedia;
	exports.shimConstraints = shimConstraints;
	exports.shimRTCIceServerUrls = shimRTCIceServerUrls;
	exports.shimTrackEventTransceiver = shimTrackEventTransceiver;
	exports.shimCreateOfferLegacy = shimCreateOfferLegacy;
	exports.shimAudioContext = shimAudioContext;
	
	var _utils = require('../utils');
	
	var utils = _interopRequireWildcard(_utils);
	
	function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) newObj[key] = obj[key]; } } newObj.default = obj; return newObj; } }
	
	function shimLocalStreamsAPI(window) {
	  if ((typeof window === 'undefined' ? 'undefined' : _typeof(window)) !== 'object' || !window.RTCPeerConnection) {
		return;
	  }
	  if (!('getLocalStreams' in window.RTCPeerConnection.prototype)) {
		window.RTCPeerConnection.prototype.getLocalStreams = function getLocalStreams() {
		  if (!this._localStreams) {
			this._localStreams = [];
		  }
		  return this._localStreams;
		};
	  }
	  if (!('addStream' in window.RTCPeerConnection.prototype)) {
		var _addTrack = window.RTCPeerConnection.prototype.addTrack;
		window.RTCPeerConnection.prototype.addStream = function addStream(stream) {
		  var _this = this;
	
		  if (!this._localStreams) {
			this._localStreams = [];
		  }
		  if (!this._localStreams.includes(stream)) {
			this._localStreams.push(stream);
		  }
		  // Try to emulate Chrome's behaviour of adding in audio-video order.
		  // Safari orders by track id.
		  stream.getAudioTracks().forEach(function (track) {
			return _addTrack.call(_this, track, stream);
		  });
		  stream.getVideoTracks().forEach(function (track) {
			return _addTrack.call(_this, track, stream);
		  });
		};
	
		window.RTCPeerConnection.prototype.addTrack = function addTrack(track) {
		  var _this2 = this;
	
		  for (var _len = arguments.length, streams = Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
			streams[_key - 1] = arguments[_key];
		  }
	
		  if (streams) {
			streams.forEach(function (stream) {
			  if (!_this2._localStreams) {
				_this2._localStreams = [stream];
			  } else if (!_this2._localStreams.includes(stream)) {
				_this2._localStreams.push(stream);
			  }
			});
		  }
		  return _addTrack.apply(this, arguments);
		};
	  }
	  if (!('removeStream' in window.RTCPeerConnection.prototype)) {
		window.RTCPeerConnection.prototype.removeStream = function removeStream(stream) {
		  var _this3 = this;
	
		  if (!this._localStreams) {
			this._localStreams = [];
		  }
		  var index = this._localStreams.indexOf(stream);
		  if (index === -1) {
			return;
		  }
		  this._localStreams.splice(index, 1);
		  var tracks = stream.getTracks();
		  this.getSenders().forEach(function (sender) {
			if (tracks.includes(sender.track)) {
			  _this3.removeTrack(sender);
			}
		  });
		};
	  }
	}
	
	function shimRemoteStreamsAPI(window) {
	  if ((typeof window === 'undefined' ? 'undefined' : _typeof(window)) !== 'object' || !window.RTCPeerConnection) {
		return;
	  }
	  if (!('getRemoteStreams' in window.RTCPeerConnection.prototype)) {
		window.RTCPeerConnection.prototype.getRemoteStreams = function getRemoteStreams() {
		  return this._remoteStreams ? this._remoteStreams : [];
		};
	  }
	  if (!('onaddstream' in window.RTCPeerConnection.prototype)) {
		Object.defineProperty(window.RTCPeerConnection.prototype, 'onaddstream', {
		  get: function get() {
			return this._onaddstream;
		  },
		  set: function set(f) {
			var _this4 = this;
	
			if (this._onaddstream) {
			  this.removeEventListener('addstream', this._onaddstream);
			  this.removeEventListener('track', this._onaddstreampoly);
			}
			this.addEventListener('addstream', this._onaddstream = f);
			this.addEventListener('track', this._onaddstreampoly = function (e) {
			  e.streams.forEach(function (stream) {
				if (!_this4._remoteStreams) {
				  _this4._remoteStreams = [];
				}
				if (_this4._remoteStreams.includes(stream)) {
				  return;
				}
				_this4._remoteStreams.push(stream);
				var event = new Event('addstream');
				event.stream = stream;
				_this4.dispatchEvent(event);
			  });
			});
		  }
		});
		var origSetRemoteDescription = window.RTCPeerConnection.prototype.setRemoteDescription;
		window.RTCPeerConnection.prototype.setRemoteDescription = function setRemoteDescription() {
		  var pc = this;
		  if (!this._onaddstreampoly) {
			this.addEventListener('track', this._onaddstreampoly = function (e) {
			  e.streams.forEach(function (stream) {
				if (!pc._remoteStreams) {
				  pc._remoteStreams = [];
				}
				if (pc._remoteStreams.indexOf(stream) >= 0) {
				  return;
				}
				pc._remoteStreams.push(stream);
				var event = new Event('addstream');
				event.stream = stream;
				pc.dispatchEvent(event);
			  });
			});
		  }
		  return origSetRemoteDescription.apply(pc, arguments);
		};
	  }
	}
	
	function shimCallbacksAPI(window) {
	  if ((typeof window === 'undefined' ? 'undefined' : _typeof(window)) !== 'object' || !window.RTCPeerConnection) {
		return;
	  }
	  var prototype = window.RTCPeerConnection.prototype;
	  var origCreateOffer = prototype.createOffer;
	  var origCreateAnswer = prototype.createAnswer;
	  var setLocalDescription = prototype.setLocalDescription;
	  var setRemoteDescription = prototype.setRemoteDescription;
	  var addIceCandidate = prototype.addIceCandidate;
	
	  prototype.createOffer = function createOffer(successCallback, failureCallback) {
		var options = arguments.length >= 2 ? arguments[2] : arguments[0];
		var promise = origCreateOffer.apply(this, [options]);
		if (!failureCallback) {
		  return promise;
		}
		promise.then(successCallback, failureCallback);
		return Promise.resolve();
	  };
	
	  prototype.createAnswer = function createAnswer(successCallback, failureCallback) {
		var options = arguments.length >= 2 ? arguments[2] : arguments[0];
		var promise = origCreateAnswer.apply(this, [options]);
		if (!failureCallback) {
		  return promise;
		}
		promise.then(successCallback, failureCallback);
		return Promise.resolve();
	  };
	
	  var withCallback = function withCallback(description, successCallback, failureCallback) {
		var promise = setLocalDescription.apply(this, [description]);
		if (!failureCallback) {
		  return promise;
		}
		promise.then(successCallback, failureCallback);
		return Promise.resolve();
	  };
	  prototype.setLocalDescription = withCallback;
	
	  withCallback = function withCallback(description, successCallback, failureCallback) {
		var promise = setRemoteDescription.apply(this, [description]);
		if (!failureCallback) {
		  return promise;
		}
		promise.then(successCallback, failureCallback);
		return Promise.resolve();
	  };
	  prototype.setRemoteDescription = withCallback;
	
	  withCallback = function withCallback(candidate, successCallback, failureCallback) {
		var promise = addIceCandidate.apply(this, [candidate]);
		if (!failureCallback) {
		  return promise;
		}
		promise.then(successCallback, failureCallback);
		return Promise.resolve();
	  };
	  prototype.addIceCandidate = withCallback;
	}
	
	function shimGetUserMedia(window) {
	  var navigator = window && window.navigator;
	
	  if (navigator.mediaDevices && navigator.mediaDevices.getUserMedia) {
		// shim not needed in Safari 12.1
		var mediaDevices = navigator.mediaDevices;
		var _getUserMedia = mediaDevices.getUserMedia.bind(mediaDevices);
		navigator.mediaDevices.getUserMedia = function (constraints) {
		  return _getUserMedia(shimConstraints(constraints));
		};
	  }
	
	  if (!navigator.getUserMedia && navigator.mediaDevices && navigator.mediaDevices.getUserMedia) {
		navigator.getUserMedia = function getUserMedia(constraints, cb, errcb) {
		  navigator.mediaDevices.getUserMedia(constraints).then(cb, errcb);
		}.bind(navigator);
	  }
	}
	
	function shimConstraints(constraints) {
	  if (constraints && constraints.video !== undefined) {
		return Object.assign({}, constraints, { video: utils.compactObject(constraints.video) });
	  }
	
	  return constraints;
	}
	
	function shimRTCIceServerUrls(window) {
	  if (!window.RTCPeerConnection) {
		return;
	  }
	  // migrate from non-spec RTCIceServer.url to RTCIceServer.urls
	  var OrigPeerConnection = window.RTCPeerConnection;
	  window.RTCPeerConnection = function RTCPeerConnection(pcConfig, pcConstraints) {
		if (pcConfig && pcConfig.iceServers) {
		  var newIceServers = [];
		  for (var i = 0; i < pcConfig.iceServers.length; i++) {
			var server = pcConfig.iceServers[i];
			if (!server.hasOwnProperty('urls') && server.hasOwnProperty('url')) {
			  utils.deprecated('RTCIceServer.url', 'RTCIceServer.urls');
			  server = JSON.parse(JSON.stringify(server));
			  server.urls = server.url;
			  delete server.url;
			  newIceServers.push(server);
			} else {
			  newIceServers.push(pcConfig.iceServers[i]);
			}
		  }
		  pcConfig.iceServers = newIceServers;
		}
		return new OrigPeerConnection(pcConfig, pcConstraints);
	  };
	  window.RTCPeerConnection.prototype = OrigPeerConnection.prototype;
	  // wrap static methods. Currently just generateCertificate.
	  if ('generateCertificate' in OrigPeerConnection) {
		Object.defineProperty(window.RTCPeerConnection, 'generateCertificate', {
		  get: function get() {
			return OrigPeerConnection.generateCertificate;
		  }
		});
	  }
	}
	
	function shimTrackEventTransceiver(window) {
	  // Add event.transceiver member over deprecated event.receiver
	  if ((typeof window === 'undefined' ? 'undefined' : _typeof(window)) === 'object' && window.RTCTrackEvent && 'receiver' in window.RTCTrackEvent.prototype && !('transceiver' in window.RTCTrackEvent.prototype)) {
		Object.defineProperty(window.RTCTrackEvent.prototype, 'transceiver', {
		  get: function get() {
			return { receiver: this.receiver };
		  }
		});
	  }
	}
	
	function shimCreateOfferLegacy(window) {
	  var origCreateOffer = window.RTCPeerConnection.prototype.createOffer;
	  window.RTCPeerConnection.prototype.createOffer = function createOffer(offerOptions) {
		if (offerOptions) {
		  if (typeof offerOptions.offerToReceiveAudio !== 'undefined') {
			// support bit values
			offerOptions.offerToReceiveAudio = !!offerOptions.offerToReceiveAudio;
		  }
		  var audioTransceiver = this.getTransceivers().find(function (transceiver) {
			return transceiver.receiver.track.kind === 'audio';
		  });
		  if (offerOptions.offerToReceiveAudio === false && audioTransceiver) {
			if (audioTransceiver.direction === 'sendrecv') {
			  if (audioTransceiver.setDirection) {
				audioTransceiver.setDirection('sendonly');
			  } else {
				audioTransceiver.direction = 'sendonly';
			  }
			} else if (audioTransceiver.direction === 'recvonly') {
			  if (audioTransceiver.setDirection) {
				audioTransceiver.setDirection('inactive');
			  } else {
				audioTransceiver.direction = 'inactive';
			  }
			}
		  } else if (offerOptions.offerToReceiveAudio === true && !audioTransceiver) {
			this.addTransceiver('audio');
		  }
	
		  if (typeof offerOptions.offerToReceiveVideo !== 'undefined') {
			// support bit values
			offerOptions.offerToReceiveVideo = !!offerOptions.offerToReceiveVideo;
		  }
		  var videoTransceiver = this.getTransceivers().find(function (transceiver) {
			return transceiver.receiver.track.kind === 'video';
		  });
		  if (offerOptions.offerToReceiveVideo === false && videoTransceiver) {
			if (videoTransceiver.direction === 'sendrecv') {
			  if (videoTransceiver.setDirection) {
				videoTransceiver.setDirection('sendonly');
			  } else {
				videoTransceiver.direction = 'sendonly';
			  }
			} else if (videoTransceiver.direction === 'recvonly') {
			  if (videoTransceiver.setDirection) {
				videoTransceiver.setDirection('inactive');
			  } else {
				videoTransceiver.direction = 'inactive';
			  }
			}
		  } else if (offerOptions.offerToReceiveVideo === true && !videoTransceiver) {
			this.addTransceiver('video');
		  }
		}
		return origCreateOffer.apply(this, arguments);
	  };
	}
	
	function shimAudioContext(window) {
	  if ((typeof window === 'undefined' ? 'undefined' : _typeof(window)) !== 'object' || window.AudioContext) {
		return;
	  }
	  window.AudioContext = window.webkitAudioContext;
	}
	
	},{"../utils":11}],11:[function(require,module,exports){
	/*
	 *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
	 *
	 *  Use of this source code is governed by a BSD-style license
	 *  that can be found in the LICENSE file in the root of the source
	 *  tree.
	 */
	/* eslint-env node */
	'use strict';
	
	Object.defineProperty(exports, "__esModule", {
	  value: true
	});
	
	var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; };
	
	exports.extractVersion = extractVersion;
	exports.wrapPeerConnectionEvent = wrapPeerConnectionEvent;
	exports.disableLog = disableLog;
	exports.disableWarnings = disableWarnings;
	exports.log = log;
	exports.deprecated = deprecated;
	exports.detectBrowser = detectBrowser;
	exports.compactObject = compactObject;
	exports.walkStats = walkStats;
	exports.filterStats = filterStats;
	
	function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
	
	var logDisabled_ = true;
	var deprecationWarnings_ = true;
	
	/**
	 * Extract browser version out of the provided user agent string.
	 *
	 * @param {!string} uastring userAgent string.
	 * @param {!string} expr Regular expression used as match criteria.
	 * @param {!number} pos position in the version string to be returned.
	 * @return {!number} browser version.
	 */
	function extractVersion(uastring, expr, pos) {
	  var match = uastring.match(expr);
	  return match && match.length >= pos && parseInt(match[pos], 10);
	}
	
	// Wraps the peerconnection event eventNameToWrap in a function
	// which returns the modified event object (or false to prevent
	// the event).
	function wrapPeerConnectionEvent(window, eventNameToWrap, wrapper) {
	  if (!window.RTCPeerConnection) {
		return;
	  }
	  var proto = window.RTCPeerConnection.prototype;
	  var nativeAddEventListener = proto.addEventListener;
	  proto.addEventListener = function (nativeEventName, cb) {
		if (nativeEventName !== eventNameToWrap) {
		  return nativeAddEventListener.apply(this, arguments);
		}
		var wrappedCallback = function wrappedCallback(e) {
		  var modifiedEvent = wrapper(e);
		  if (modifiedEvent) {
			if (cb.handleEvent) {
			  cb.handleEvent(modifiedEvent);
			} else {
			  cb(modifiedEvent);
			}
		  }
		};
		this._eventMap = this._eventMap || {};
		if (!this._eventMap[eventNameToWrap]) {
		  this._eventMap[eventNameToWrap] = new Map();
		}
		this._eventMap[eventNameToWrap].set(cb, wrappedCallback);
		return nativeAddEventListener.apply(this, [nativeEventName, wrappedCallback]);
	  };
	
	  var nativeRemoveEventListener = proto.removeEventListener;
	  proto.removeEventListener = function (nativeEventName, cb) {
		if (nativeEventName !== eventNameToWrap || !this._eventMap || !this._eventMap[eventNameToWrap]) {
		  return nativeRemoveEventListener.apply(this, arguments);
		}
		if (!this._eventMap[eventNameToWrap].has(cb)) {
		  return nativeRemoveEventListener.apply(this, arguments);
		}
		var unwrappedCb = this._eventMap[eventNameToWrap].get(cb);
		this._eventMap[eventNameToWrap].delete(cb);
		if (this._eventMap[eventNameToWrap].size === 0) {
		  delete this._eventMap[eventNameToWrap];
		}
		if (Object.keys(this._eventMap).length === 0) {
		  delete this._eventMap;
		}
		return nativeRemoveEventListener.apply(this, [nativeEventName, unwrappedCb]);
	  };
	
	  Object.defineProperty(proto, 'on' + eventNameToWrap, {
		get: function get() {
		  return this['_on' + eventNameToWrap];
		},
		set: function set(cb) {
		  if (this['_on' + eventNameToWrap]) {
			this.removeEventListener(eventNameToWrap, this['_on' + eventNameToWrap]);
			delete this['_on' + eventNameToWrap];
		  }
		  if (cb) {
			this.addEventListener(eventNameToWrap, this['_on' + eventNameToWrap] = cb);
		  }
		},
	
		enumerable: true,
		configurable: true
	  });
	}
	
	function disableLog(bool) {
	  if (typeof bool !== 'boolean') {
		return new Error('Argument type: ' + (typeof bool === 'undefined' ? 'undefined' : _typeof(bool)) + '. Please use a boolean.');
	  }
	  logDisabled_ = bool;
	  return bool ? 'adapter.js logging disabled' : 'adapter.js logging enabled';
	}
	
	/**
	 * Disable or enable deprecation warnings
	 * @param {!boolean} bool set to true to disable warnings.
	 */
	function disableWarnings(bool) {
	  if (typeof bool !== 'boolean') {
		return new Error('Argument type: ' + (typeof bool === 'undefined' ? 'undefined' : _typeof(bool)) + '. Please use a boolean.');
	  }
	  deprecationWarnings_ = !bool;
	  return 'adapter.js deprecation warnings ' + (bool ? 'disabled' : 'enabled');
	}
	
	function log() {
	  if ((typeof window === 'undefined' ? 'undefined' : _typeof(window)) === 'object') {
		if (logDisabled_) {
		  return;
		}
		if (typeof console !== 'undefined' && typeof console.log === 'function') {
		  console.log.apply(console, arguments);
		}
	  }
	}
	
	/**
	 * Shows a deprecation warning suggesting the modern and spec-compatible API.
	 */
	function deprecated(oldMethod, newMethod) {
	  if (!deprecationWarnings_) {
		return;
	  }
	  console.warn(oldMethod + ' is deprecated, please use ' + newMethod + ' instead.');
	}
	
	/**
	 * Browser detector.
	 *
	 * @return {object} result containing browser and version
	 *     properties.
	 */
	function detectBrowser(window) {
	  // Returned result object.
	  var result = { browser: null, version: null };
	
	  // Fail early if it's not a browser
	  if (typeof window === 'undefined' || !window.navigator) {
		result.browser = 'Not a browser.';
		return result;
	  }
	
	  var navigator = window.navigator;
	
	
	  if (navigator.mozGetUserMedia) {
		// Firefox.
		result.browser = 'firefox';
		result.version = extractVersion(navigator.userAgent, /Firefox\/(\d+)\./, 1);
	  } else if (navigator.webkitGetUserMedia || window.isSecureContext === false && window.webkitRTCPeerConnection && !window.RTCIceGatherer) {
		// Chrome, Chromium, Webview, Opera.
		// Version matches Chrome/WebRTC version.
		// Chrome 74 removed webkitGetUserMedia on http as well so we need the
		// more complicated fallback to webkitRTCPeerConnection.
		result.browser = 'chrome';
		result.version = extractVersion(navigator.userAgent, /Chrom(e|ium)\/(\d+)\./, 2);
	  } else if (window.RTCPeerConnection && navigator.userAgent.match(/AppleWebKit\/(\d+)\./)) {
		// Safari.
		result.browser = 'safari';
		result.version = extractVersion(navigator.userAgent, /AppleWebKit\/(\d+)\./, 1);
		result.supportsUnifiedPlan = window.RTCRtpTransceiver && 'currentDirection' in window.RTCRtpTransceiver.prototype;
	  } else {
		// Default fallthrough: not supported.
		result.browser = 'Not a supported browser.';
		return result;
	  }
	
	  return result;
	}
	
	/**
	 * Checks if something is an object.
	 *
	 * @param {*} val The something you want to check.
	 * @return true if val is an object, false otherwise.
	 */
	function isObject(val) {
	  return Object.prototype.toString.call(val) === '[object Object]';
	}
	
	/**
	 * Remove all empty objects and undefined values
	 * from a nested object -- an enhanced and vanilla version
	 * of Lodash's `compact`.
	 */
	function compactObject(data) {
	  if (!isObject(data)) {
		return data;
	  }
	
	  return Object.keys(data).reduce(function (accumulator, key) {
		var isObj = isObject(data[key]);
		var value = isObj ? compactObject(data[key]) : data[key];
		var isEmptyObject = isObj && !Object.keys(value).length;
		if (value === undefined || isEmptyObject) {
		  return accumulator;
		}
		return Object.assign(accumulator, _defineProperty({}, key, value));
	  }, {});
	}
	
	/* iterates the stats graph recursively. */
	function walkStats(stats, base, resultSet) {
	  if (!base || resultSet.has(base.id)) {
		return;
	  }
	  resultSet.set(base.id, base);
	  Object.keys(base).forEach(function (name) {
		if (name.endsWith('Id')) {
		  walkStats(stats, stats.get(base[name]), resultSet);
		} else if (name.endsWith('Ids')) {
		  base[name].forEach(function (id) {
			walkStats(stats, stats.get(id), resultSet);
		  });
		}
	  });
	}
	
	/* filter getStats for a sender/receiver track. */
	function filterStats(result, track, outbound) {
	  var streamStatsType = outbound ? 'outbound-rtp' : 'inbound-rtp';
	  var filteredResult = new Map();
	  if (track === null) {
		return filteredResult;
	  }
	  var trackStats = [];
	  result.forEach(function (value) {
		if (value.type === 'track' && value.trackIdentifier === track.id) {
		  trackStats.push(value);
		}
	  });
	  trackStats.forEach(function (trackStat) {
		result.forEach(function (stats) {
		  if (stats.type === streamStatsType && stats.trackId === trackStat.id) {
			walkStats(result, stats, filteredResult);
		  }
		});
	  });
	  return filteredResult;
	}
	
	},{}],12:[function(require,module,exports){
	/* eslint-env node */
	'use strict';
	
	// SDP helpers.
	
	var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; };
	
	var SDPUtils = {};
	
	// Generate an alphanumeric identifier for cname or mids.
	// TODO: use UUIDs instead? https://gist.github.com/jed/982883
	SDPUtils.generateIdentifier = function () {
	  return Math.random().toString(36).substr(2, 10);
	};
	
	// The RTCP CNAME used by all peerconnections from the same JS.
	SDPUtils.localCName = SDPUtils.generateIdentifier();
	
	// Splits SDP into lines, dealing with both CRLF and LF.
	SDPUtils.splitLines = function (blob) {
	  return blob.trim().split('\n').map(function (line) {
		return line.trim();
	  });
	};
	// Splits SDP into sessionpart and mediasections. Ensures CRLF.
	SDPUtils.splitSections = function (blob) {
	  var parts = blob.split('\nm=');
	  return parts.map(function (part, index) {
		return (index > 0 ? 'm=' + part : part).trim() + '\r\n';
	  });
	};
	
	// returns the session description.
	SDPUtils.getDescription = function (blob) {
	  var sections = SDPUtils.splitSections(blob);
	  return sections && sections[0];
	};
	
	// returns the individual media sections.
	SDPUtils.getMediaSections = function (blob) {
	  var sections = SDPUtils.splitSections(blob);
	  sections.shift();
	  return sections;
	};
	
	// Returns lines that start with a certain prefix.
	SDPUtils.matchPrefix = function (blob, prefix) {
	  return SDPUtils.splitLines(blob).filter(function (line) {
		return line.indexOf(prefix) === 0;
	  });
	};
	
	// Parses an ICE candidate line. Sample input:
	// candidate:702786350 2 udp 41819902 8.8.8.8 60769 typ relay raddr 8.8.8.8
	// rport 55996"
	SDPUtils.parseCandidate = function (line) {
	  var parts = void 0;
	  // Parse both variants.
	  if (line.indexOf('a=candidate:') === 0) {
		parts = line.substring(12).split(' ');
	  } else {
		parts = line.substring(10).split(' ');
	  }
	
	  var candidate = {
		foundation: parts[0],
		component: { 1: 'rtp', 2: 'rtcp' }[parts[1]],
		protocol: parts[2].toLowerCase(),
		priority: parseInt(parts[3], 10),
		ip: parts[4],
		address: parts[4], // address is an alias for ip.
		port: parseInt(parts[5], 10),
		// skip parts[6] == 'typ'
		type: parts[7]
	  };
	
	  for (var i = 8; i < parts.length; i += 2) {
		switch (parts[i]) {
		  case 'raddr':
			candidate.relatedAddress = parts[i + 1];
			break;
		  case 'rport':
			candidate.relatedPort = parseInt(parts[i + 1], 10);
			break;
		  case 'tcptype':
			candidate.tcpType = parts[i + 1];
			break;
		  case 'ufrag':
			candidate.ufrag = parts[i + 1]; // for backward compatibility.
			candidate.usernameFragment = parts[i + 1];
			break;
		  default:
			// extension handling, in particular ufrag. Don't overwrite.
			if (candidate[parts[i]] === undefined) {
			  candidate[parts[i]] = parts[i + 1];
			}
			break;
		}
	  }
	  return candidate;
	};
	
	// Translates a candidate object into SDP candidate attribute.
	SDPUtils.writeCandidate = function (candidate) {
	  var sdp = [];
	  sdp.push(candidate.foundation);
	
	  var component = candidate.component;
	  if (component === 'rtp') {
		sdp.push(1);
	  } else if (component === 'rtcp') {
		sdp.push(2);
	  } else {
		sdp.push(component);
	  }
	  sdp.push(candidate.protocol.toUpperCase());
	  sdp.push(candidate.priority);
	  sdp.push(candidate.address || candidate.ip);
	  sdp.push(candidate.port);
	
	  var type = candidate.type;
	  sdp.push('typ');
	  sdp.push(type);
	  if (type !== 'host' && candidate.relatedAddress && candidate.relatedPort) {
		sdp.push('raddr');
		sdp.push(candidate.relatedAddress);
		sdp.push('rport');
		sdp.push(candidate.relatedPort);
	  }
	  if (candidate.tcpType && candidate.protocol.toLowerCase() === 'tcp') {
		sdp.push('tcptype');
		sdp.push(candidate.tcpType);
	  }
	  if (candidate.usernameFragment || candidate.ufrag) {
		sdp.push('ufrag');
		sdp.push(candidate.usernameFragment || candidate.ufrag);
	  }
	  return 'candidate:' + sdp.join(' ');
	};
	
	// Parses an ice-options line, returns an array of option tags.
	// a=ice-options:foo bar
	SDPUtils.parseIceOptions = function (line) {
	  return line.substr(14).split(' ');
	};
	
	// Parses an rtpmap line, returns RTCRtpCoddecParameters. Sample input:
	// a=rtpmap:111 opus/48000/2
	SDPUtils.parseRtpMap = function (line) {
	  var parts = line.substr(9).split(' ');
	  var parsed = {
		payloadType: parseInt(parts.shift(), 10) // was: id
	  };
	
	  parts = parts[0].split('/');
	
	  parsed.name = parts[0];
	  parsed.clockRate = parseInt(parts[1], 10); // was: clockrate
	  parsed.channels = parts.length === 3 ? parseInt(parts[2], 10) : 1;
	  // legacy alias, got renamed back to channels in ORTC.
	  parsed.numChannels = parsed.channels;
	  return parsed;
	};
	
	// Generate an a=rtpmap line from RTCRtpCodecCapability or
	// RTCRtpCodecParameters.
	SDPUtils.writeRtpMap = function (codec) {
	  var pt = codec.payloadType;
	  if (codec.preferredPayloadType !== undefined) {
		pt = codec.preferredPayloadType;
	  }
	  var channels = codec.channels || codec.numChannels || 1;
	  return 'a=rtpmap:' + pt + ' ' + codec.name + '/' + codec.clockRate + (channels !== 1 ? '/' + channels : '') + '\r\n';
	};
	
	// Parses an a=extmap line (headerextension from RFC 5285). Sample input:
	// a=extmap:2 urn:ietf:params:rtp-hdrext:toffset
	// a=extmap:2/sendonly urn:ietf:params:rtp-hdrext:toffset
	SDPUtils.parseExtmap = function (line) {
	  var parts = line.substr(9).split(' ');
	  return {
		id: parseInt(parts[0], 10),
		direction: parts[0].indexOf('/') > 0 ? parts[0].split('/')[1] : 'sendrecv',
		uri: parts[1]
	  };
	};
	
	// Generates a=extmap line from RTCRtpHeaderExtensionParameters or
	// RTCRtpHeaderExtension.
	SDPUtils.writeExtmap = function (headerExtension) {
	  return 'a=extmap:' + (headerExtension.id || headerExtension.preferredId) + (headerExtension.direction && headerExtension.direction !== 'sendrecv' ? '/' + headerExtension.direction : '') + ' ' + headerExtension.uri + '\r\n';
	};
	
	// Parses an ftmp line, returns dictionary. Sample input:
	// a=fmtp:96 vbr=on;cng=on
	// Also deals with vbr=on; cng=on
	SDPUtils.parseFmtp = function (line) {
	  var parsed = {};
	  var kv = void 0;
	  var parts = line.substr(line.indexOf(' ') + 1).split(';');
	  for (var j = 0; j < parts.length; j++) {
		kv = parts[j].trim().split('=');
		parsed[kv[0].trim()] = kv[1];
	  }
	  return parsed;
	};
	
	// Generates an a=ftmp line from RTCRtpCodecCapability or RTCRtpCodecParameters.
	SDPUtils.writeFmtp = function (codec) {
	  var line = '';
	  var pt = codec.payloadType;
	  if (codec.preferredPayloadType !== undefined) {
		pt = codec.preferredPayloadType;
	  }
	  if (codec.parameters && Object.keys(codec.parameters).length) {
		var params = [];
		Object.keys(codec.parameters).forEach(function (param) {
		  if (codec.parameters[param]) {
			params.push(param + '=' + codec.parameters[param]);
		  } else {
			params.push(param);
		  }
		});
		line += 'a=fmtp:' + pt + ' ' + params.join(';') + '\r\n';
	  }
	  return line;
	};
	
	// Parses an rtcp-fb line, returns RTCPRtcpFeedback object. Sample input:
	// a=rtcp-fb:98 nack rpsi
	SDPUtils.parseRtcpFb = function (line) {
	  var parts = line.substr(line.indexOf(' ') + 1).split(' ');
	  return {
		type: parts.shift(),
		parameter: parts.join(' ')
	  };
	};
	// Generate a=rtcp-fb lines from RTCRtpCodecCapability or RTCRtpCodecParameters.
	SDPUtils.writeRtcpFb = function (codec) {
	  var lines = '';
	  var pt = codec.payloadType;
	  if (codec.preferredPayloadType !== undefined) {
		pt = codec.preferredPayloadType;
	  }
	  if (codec.rtcpFeedback && codec.rtcpFeedback.length) {
		// FIXME: special handling for trr-int?
		codec.rtcpFeedback.forEach(function (fb) {
		  lines += 'a=rtcp-fb:' + pt + ' ' + fb.type + (fb.parameter && fb.parameter.length ? ' ' + fb.parameter : '') + '\r\n';
		});
	  }
	  return lines;
	};
	
	// Parses an RFC 5576 ssrc media attribute. Sample input:
	// a=ssrc:3735928559 cname:something
	SDPUtils.parseSsrcMedia = function (line) {
	  var sp = line.indexOf(' ');
	  var parts = {
		ssrc: parseInt(line.substr(7, sp - 7), 10)
	  };
	  var colon = line.indexOf(':', sp);
	  if (colon > -1) {
		parts.attribute = line.substr(sp + 1, colon - sp - 1);
		parts.value = line.substr(colon + 1);
	  } else {
		parts.attribute = line.substr(sp + 1);
	  }
	  return parts;
	};
	
	SDPUtils.parseSsrcGroup = function (line) {
	  var parts = line.substr(13).split(' ');
	  return {
		semantics: parts.shift(),
		ssrcs: parts.map(function (ssrc) {
		  return parseInt(ssrc, 10);
		})
	  };
	};
	
	// Extracts the MID (RFC 5888) from a media section.
	// returns the MID or undefined if no mid line was found.
	SDPUtils.getMid = function (mediaSection) {
	  var mid = SDPUtils.matchPrefix(mediaSection, 'a=mid:')[0];
	  if (mid) {
		return mid.substr(6);
	  }
	};
	
	SDPUtils.parseFingerprint = function (line) {
	  var parts = line.substr(14).split(' ');
	  return {
		algorithm: parts[0].toLowerCase(), // algorithm is case-sensitive in Edge.
		value: parts[1]
	  };
	};
	
	// Extracts DTLS parameters from SDP media section or sessionpart.
	// FIXME: for consistency with other functions this should only
	//   get the fingerprint line as input. See also getIceParameters.
	SDPUtils.getDtlsParameters = function (mediaSection, sessionpart) {
	  var lines = SDPUtils.matchPrefix(mediaSection + sessionpart, 'a=fingerprint:');
	  // Note: a=setup line is ignored since we use the 'auto' role.
	  // Note2: 'algorithm' is not case sensitive except in Edge.
	  return {
		role: 'auto',
		fingerprints: lines.map(SDPUtils.parseFingerprint)
	  };
	};
	
	// Serializes DTLS parameters to SDP.
	SDPUtils.writeDtlsParameters = function (params, setupType) {
	  var sdp = 'a=setup:' + setupType + '\r\n';
	  params.fingerprints.forEach(function (fp) {
		sdp += 'a=fingerprint:' + fp.algorithm + ' ' + fp.value + '\r\n';
	  });
	  return sdp;
	};
	
	// Parses a=crypto lines into
	//   https://rawgit.com/aboba/edgertc/master/msortc-rs4.html#dictionary-rtcsrtpsdesparameters-members
	SDPUtils.parseCryptoLine = function (line) {
	  var parts = line.substr(9).split(' ');
	  return {
		tag: parseInt(parts[0], 10),
		cryptoSuite: parts[1],
		keyParams: parts[2],
		sessionParams: parts.slice(3)
	  };
	};
	
	SDPUtils.writeCryptoLine = function (parameters) {
	  return 'a=crypto:' + parameters.tag + ' ' + parameters.cryptoSuite + ' ' + (_typeof(parameters.keyParams) === 'object' ? SDPUtils.writeCryptoKeyParams(parameters.keyParams) : parameters.keyParams) + (parameters.sessionParams ? ' ' + parameters.sessionParams.join(' ') : '') + '\r\n';
	};
	
	// Parses the crypto key parameters into
	//   https://rawgit.com/aboba/edgertc/master/msortc-rs4.html#rtcsrtpkeyparam*
	SDPUtils.parseCryptoKeyParams = function (keyParams) {
	  if (keyParams.indexOf('inline:') !== 0) {
		return null;
	  }
	  var parts = keyParams.substr(7).split('|');
	  return {
		keyMethod: 'inline',
		keySalt: parts[0],
		lifeTime: parts[1],
		mkiValue: parts[2] ? parts[2].split(':')[0] : undefined,
		mkiLength: parts[2] ? parts[2].split(':')[1] : undefined
	  };
	};
	
	SDPUtils.writeCryptoKeyParams = function (keyParams) {
	  return keyParams.keyMethod + ':' + keyParams.keySalt + (keyParams.lifeTime ? '|' + keyParams.lifeTime : '') + (keyParams.mkiValue && keyParams.mkiLength ? '|' + keyParams.mkiValue + ':' + keyParams.mkiLength : '');
	};
	
	// Extracts all SDES parameters.
	SDPUtils.getCryptoParameters = function (mediaSection, sessionpart) {
	  var lines = SDPUtils.matchPrefix(mediaSection + sessionpart, 'a=crypto:');
	  return lines.map(SDPUtils.parseCryptoLine);
	};
	
	// Parses ICE information from SDP media section or sessionpart.
	// FIXME: for consistency with other functions this should only
	//   get the ice-ufrag and ice-pwd lines as input.
	SDPUtils.getIceParameters = function (mediaSection, sessionpart) {
	  var ufrag = SDPUtils.matchPrefix(mediaSection + sessionpart, 'a=ice-ufrag:')[0];
	  var pwd = SDPUtils.matchPrefix(mediaSection + sessionpart, 'a=ice-pwd:')[0];
	  if (!(ufrag && pwd)) {
		return null;
	  }
	  return {
		usernameFragment: ufrag.substr(12),
		password: pwd.substr(10)
	  };
	};
	
	// Serializes ICE parameters to SDP.
	SDPUtils.writeIceParameters = function (params) {
	  var sdp = 'a=ice-ufrag:' + params.usernameFragment + '\r\n' + 'a=ice-pwd:' + params.password + '\r\n';
	  if (params.iceLite) {
		sdp += 'a=ice-lite\r\n';
	  }
	  return sdp;
	};
	
	// Parses the SDP media section and returns RTCRtpParameters.
	SDPUtils.parseRtpParameters = function (mediaSection) {
	  var description = {
		codecs: [],
		headerExtensions: [],
		fecMechanisms: [],
		rtcp: []
	  };
	  var lines = SDPUtils.splitLines(mediaSection);
	  var mline = lines[0].split(' ');
	  for (var i = 3; i < mline.length; i++) {
		// find all codecs from mline[3..]
		var pt = mline[i];
		var rtpmapline = SDPUtils.matchPrefix(mediaSection, 'a=rtpmap:' + pt + ' ')[0];
		if (rtpmapline) {
		  var codec = SDPUtils.parseRtpMap(rtpmapline);
		  var fmtps = SDPUtils.matchPrefix(mediaSection, 'a=fmtp:' + pt + ' ');
		  // Only the first a=fmtp:<pt> is considered.
		  codec.parameters = fmtps.length ? SDPUtils.parseFmtp(fmtps[0]) : {};
		  codec.rtcpFeedback = SDPUtils.matchPrefix(mediaSection, 'a=rtcp-fb:' + pt + ' ').map(SDPUtils.parseRtcpFb);
		  description.codecs.push(codec);
		  // parse FEC mechanisms from rtpmap lines.
		  switch (codec.name.toUpperCase()) {
			case 'RED':
			case 'ULPFEC':
			  description.fecMechanisms.push(codec.name.toUpperCase());
			  break;
			default:
			  // only RED and ULPFEC are recognized as FEC mechanisms.
			  break;
		  }
		}
	  }
	  SDPUtils.matchPrefix(mediaSection, 'a=extmap:').forEach(function (line) {
		description.headerExtensions.push(SDPUtils.parseExtmap(line));
	  });
	  // FIXME: parse rtcp.
	  return description;
	};
	
	// Generates parts of the SDP media section describing the capabilities /
	// parameters.
	SDPUtils.writeRtpDescription = function (kind, caps) {
	  var sdp = '';
	
	  // Build the mline.
	  sdp += 'm=' + kind + ' ';
	  sdp += caps.codecs.length > 0 ? '9' : '0'; // reject if no codecs.
	  sdp += ' UDP/TLS/RTP/SAVPF ';
	  sdp += caps.codecs.map(function (codec) {
		if (codec.preferredPayloadType !== undefined) {
		  return codec.preferredPayloadType;
		}
		return codec.payloadType;
	  }).join(' ') + '\r\n';
	
	  sdp += 'c=IN IP4 0.0.0.0\r\n';
	  sdp += 'a=rtcp:9 IN IP4 0.0.0.0\r\n';
	
	  // Add a=rtpmap lines for each codec. Also fmtp and rtcp-fb.
	  caps.codecs.forEach(function (codec) {
		sdp += SDPUtils.writeRtpMap(codec);
		sdp += SDPUtils.writeFmtp(codec);
		sdp += SDPUtils.writeRtcpFb(codec);
	  });
	  var maxptime = 0;
	  caps.codecs.forEach(function (codec) {
		if (codec.maxptime > maxptime) {
		  maxptime = codec.maxptime;
		}
	  });
	  if (maxptime > 0) {
		sdp += 'a=maxptime:' + maxptime + '\r\n';
	  }
	
	  if (caps.headerExtensions) {
		caps.headerExtensions.forEach(function (extension) {
		  sdp += SDPUtils.writeExtmap(extension);
		});
	  }
	  // FIXME: write fecMechanisms.
	  return sdp;
	};
	
	// Parses the SDP media section and returns an array of
	// RTCRtpEncodingParameters.
	SDPUtils.parseRtpEncodingParameters = function (mediaSection) {
	  var encodingParameters = [];
	  var description = SDPUtils.parseRtpParameters(mediaSection);
	  var hasRed = description.fecMechanisms.indexOf('RED') !== -1;
	  var hasUlpfec = description.fecMechanisms.indexOf('ULPFEC') !== -1;
	
	  // filter a=ssrc:... cname:, ignore PlanB-msid
	  var ssrcs = SDPUtils.matchPrefix(mediaSection, 'a=ssrc:').map(function (line) {
		return SDPUtils.parseSsrcMedia(line);
	  }).filter(function (parts) {
		return parts.attribute === 'cname';
	  });
	  var primarySsrc = ssrcs.length > 0 && ssrcs[0].ssrc;
	  var secondarySsrc = void 0;
	
	  var flows = SDPUtils.matchPrefix(mediaSection, 'a=ssrc-group:FID').map(function (line) {
		var parts = line.substr(17).split(' ');
		return parts.map(function (part) {
		  return parseInt(part, 10);
		});
	  });
	  if (flows.length > 0 && flows[0].length > 1 && flows[0][0] === primarySsrc) {
		secondarySsrc = flows[0][1];
	  }
	
	  description.codecs.forEach(function (codec) {
		if (codec.name.toUpperCase() === 'RTX' && codec.parameters.apt) {
		  var encParam = {
			ssrc: primarySsrc,
			codecPayloadType: parseInt(codec.parameters.apt, 10)
		  };
		  if (primarySsrc && secondarySsrc) {
			encParam.rtx = { ssrc: secondarySsrc };
		  }
		  encodingParameters.push(encParam);
		  if (hasRed) {
			encParam = JSON.parse(JSON.stringify(encParam));
			encParam.fec = {
			  ssrc: primarySsrc,
			  mechanism: hasUlpfec ? 'red+ulpfec' : 'red'
			};
			encodingParameters.push(encParam);
		  }
		}
	  });
	  if (encodingParameters.length === 0 && primarySsrc) {
		encodingParameters.push({
		  ssrc: primarySsrc
		});
	  }
	
	  // we support both b=AS and b=TIAS but interpret AS as TIAS.
	  var bandwidth = SDPUtils.matchPrefix(mediaSection, 'b=');
	  if (bandwidth.length) {
		if (bandwidth[0].indexOf('b=TIAS:') === 0) {
		  bandwidth = parseInt(bandwidth[0].substr(7), 10);
		} else if (bandwidth[0].indexOf('b=AS:') === 0) {
		  // use formula from JSEP to convert b=AS to TIAS value.
		  bandwidth = parseInt(bandwidth[0].substr(5), 10) * 1000 * 0.95 - 50 * 40 * 8;
		} else {
		  bandwidth = undefined;
		}
		encodingParameters.forEach(function (params) {
		  params.maxBitrate = bandwidth;
		});
	  }
	  return encodingParameters;
	};
	
	// parses http://draft.ortc.org/#rtcrtcpparameters*
	SDPUtils.parseRtcpParameters = function (mediaSection) {
	  var rtcpParameters = {};
	
	  // Gets the first SSRC. Note that with RTX there might be multiple
	  // SSRCs.
	  var remoteSsrc = SDPUtils.matchPrefix(mediaSection, 'a=ssrc:').map(function (line) {
		return SDPUtils.parseSsrcMedia(line);
	  }).filter(function (obj) {
		return obj.attribute === 'cname';
	  })[0];
	  if (remoteSsrc) {
		rtcpParameters.cname = remoteSsrc.value;
		rtcpParameters.ssrc = remoteSsrc.ssrc;
	  }
	
	  // Edge uses the compound attribute instead of reducedSize
	  // compound is !reducedSize
	  var rsize = SDPUtils.matchPrefix(mediaSection, 'a=rtcp-rsize');
	  rtcpParameters.reducedSize = rsize.length > 0;
	  rtcpParameters.compound = rsize.length === 0;
	
	  // parses the rtcp-mux attrіbute.
	  // Note that Edge does not support unmuxed RTCP.
	  var mux = SDPUtils.matchPrefix(mediaSection, 'a=rtcp-mux');
	  rtcpParameters.mux = mux.length > 0;
	
	  return rtcpParameters;
	};
	
	SDPUtils.writeRtcpParameters = function (rtcpParameters) {
	  var sdp = '';
	  if (rtcpParameters.reducedSize) {
		sdp += 'a=rtcp-rsize\r\n';
	  }
	  if (rtcpParameters.mux) {
		sdp += 'a=rtcp-mux\r\n';
	  }
	  if (rtcpParameters.ssrc !== undefined && rtcpParameters.cname) {
		sdp += 'a=ssrc:' + rtcpParameters.ssrc + ' cname:' + rtcpParameters.cname + '\r\n';
	  }
	  return sdp;
	};
	
	// parses either a=msid: or a=ssrc:... msid lines and returns
	// the id of the MediaStream and MediaStreamTrack.
	SDPUtils.parseMsid = function (mediaSection) {
	  var parts = void 0;
	  var spec = SDPUtils.matchPrefix(mediaSection, 'a=msid:');
	  if (spec.length === 1) {
		parts = spec[0].substr(7).split(' ');
		return { stream: parts[0], track: parts[1] };
	  }
	  var planB = SDPUtils.matchPrefix(mediaSection, 'a=ssrc:').map(function (line) {
		return SDPUtils.parseSsrcMedia(line);
	  }).filter(function (msidParts) {
		return msidParts.attribute === 'msid';
	  });
	  if (planB.length > 0) {
		parts = planB[0].value.split(' ');
		return { stream: parts[0], track: parts[1] };
	  }
	};
	
	// SCTP
	// parses draft-ietf-mmusic-sctp-sdp-26 first and falls back
	// to draft-ietf-mmusic-sctp-sdp-05
	SDPUtils.parseSctpDescription = function (mediaSection) {
	  var mline = SDPUtils.parseMLine(mediaSection);
	  var maxSizeLine = SDPUtils.matchPrefix(mediaSection, 'a=max-message-size:');
	  var maxMessageSize = void 0;
	  if (maxSizeLine.length > 0) {
		maxMessageSize = parseInt(maxSizeLine[0].substr(19), 10);
	  }
	  if (isNaN(maxMessageSize)) {
		maxMessageSize = 65536;
	  }
	  var sctpPort = SDPUtils.matchPrefix(mediaSection, 'a=sctp-port:');
	  if (sctpPort.length > 0) {
		return {
		  port: parseInt(sctpPort[0].substr(12), 10),
		  protocol: mline.fmt,
		  maxMessageSize: maxMessageSize
		};
	  }
	  var sctpMapLines = SDPUtils.matchPrefix(mediaSection, 'a=sctpmap:');
	  if (sctpMapLines.length > 0) {
		var parts = sctpMapLines[0].substr(10).split(' ');
		return {
		  port: parseInt(parts[0], 10),
		  protocol: parts[1],
		  maxMessageSize: maxMessageSize
		};
	  }
	};
	
	// SCTP
	// outputs the draft-ietf-mmusic-sctp-sdp-26 version that all browsers
	// support by now receiving in this format, unless we originally parsed
	// as the draft-ietf-mmusic-sctp-sdp-05 format (indicated by the m-line
	// protocol of DTLS/SCTP -- without UDP/ or TCP/)
	SDPUtils.writeSctpDescription = function (media, sctp) {
	  var output = [];
	  if (media.protocol !== 'DTLS/SCTP') {
		output = ['m=' + media.kind + ' 9 ' + media.protocol + ' ' + sctp.protocol + '\r\n', 'c=IN IP4 0.0.0.0\r\n', 'a=sctp-port:' + sctp.port + '\r\n'];
	  } else {
		output = ['m=' + media.kind + ' 9 ' + media.protocol + ' ' + sctp.port + '\r\n', 'c=IN IP4 0.0.0.0\r\n', 'a=sctpmap:' + sctp.port + ' ' + sctp.protocol + ' 65535\r\n'];
	  }
	  if (sctp.maxMessageSize !== undefined) {
		output.push('a=max-message-size:' + sctp.maxMessageSize + '\r\n');
	  }
	  return output.join('');
	};
	
	// Generate a session ID for SDP.
	// https://tools.ietf.org/html/draft-ietf-rtcweb-jsep-20#section-5.2.1
	// recommends using a cryptographically random +ve 64-bit value
	// but right now this should be acceptable and within the right range
	SDPUtils.generateSessionId = function () {
	  return Math.random().toString().substr(2, 21);
	};
	
	// Write boiler plate for start of SDP
	// sessId argument is optional - if not supplied it will
	// be generated randomly
	// sessVersion is optional and defaults to 2
	// sessUser is optional and defaults to 'thisisadapterortc'
	SDPUtils.writeSessionBoilerplate = function (sessId, sessVer, sessUser) {
	  var sessionId = void 0;
	  var version = sessVer !== undefined ? sessVer : 2;
	  if (sessId) {
		sessionId = sessId;
	  } else {
		sessionId = SDPUtils.generateSessionId();
	  }
	  var user = sessUser || 'thisisadapterortc';
	  // FIXME: sess-id should be an NTP timestamp.
	  return 'v=0\r\n' + 'o=' + user + ' ' + sessionId + ' ' + version + ' IN IP4 127.0.0.1\r\n' + 's=-\r\n' + 't=0 0\r\n';
	};
	
	// Gets the direction from the mediaSection or the sessionpart.
	SDPUtils.getDirection = function (mediaSection, sessionpart) {
	  // Look for sendrecv, sendonly, recvonly, inactive, default to sendrecv.
	  var lines = SDPUtils.splitLines(mediaSection);
	  for (var i = 0; i < lines.length; i++) {
		switch (lines[i]) {
		  case 'a=sendrecv':
		  case 'a=sendonly':
		  case 'a=recvonly':
		  case 'a=inactive':
			return lines[i].substr(2);
		  default:
		  // FIXME: What should happen here?
		}
	  }
	  if (sessionpart) {
		return SDPUtils.getDirection(sessionpart);
	  }
	  return 'sendrecv';
	};
	
	SDPUtils.getKind = function (mediaSection) {
	  var lines = SDPUtils.splitLines(mediaSection);
	  var mline = lines[0].split(' ');
	  return mline[0].substr(2);
	};
	
	SDPUtils.isRejected = function (mediaSection) {
	  return mediaSection.split(' ', 2)[1] === '0';
	};
	
	SDPUtils.parseMLine = function (mediaSection) {
	  var lines = SDPUtils.splitLines(mediaSection);
	  var parts = lines[0].substr(2).split(' ');
	  return {
		kind: parts[0],
		port: parseInt(parts[1], 10),
		protocol: parts[2],
		fmt: parts.slice(3).join(' ')
	  };
	};
	
	SDPUtils.parseOLine = function (mediaSection) {
	  var line = SDPUtils.matchPrefix(mediaSection, 'o=')[0];
	  var parts = line.substr(2).split(' ');
	  return {
		username: parts[0],
		sessionId: parts[1],
		sessionVersion: parseInt(parts[2], 10),
		netType: parts[3],
		addressType: parts[4],
		address: parts[5]
	  };
	};
	
	// a very naive interpretation of a valid SDP.
	SDPUtils.isValidSDP = function (blob) {
	  if (typeof blob !== 'string' || blob.length === 0) {
		return false;
	  }
	  var lines = SDPUtils.splitLines(blob);
	  for (var i = 0; i < lines.length; i++) {
		if (lines[i].length < 2 || lines[i].charAt(1) !== '=') {
		  return false;
		}
		// TODO: check the modifier a bit more.
	  }
	  return true;
	};
	
	// Expose public methods.
	if ((typeof module === 'undefined' ? 'undefined' : _typeof(module)) === 'object') {
	  module.exports = SDPUtils;
	}
	},{}]},{},[1])(1)
	});
	